Model Railroad Scale List

Christopher Coleman, tinplate@spikesys.com
Last Updated: October 14, 2000

The purpose of this list is to offer a potential entry into the hobby all the information on gauge and scale he/she could possibly want. This list is always developing, so do not take it as the gospel truth. I need your input to make it more complete and accurate.

This attempts to represent model railroads, scale and collectible. I've tried to include only manufacturers who produce a reasonable product line to keep the list manageable. Theoretical Gauge shows the exact model gauge that corresponds to the prototype gauge being modeled. This is only meaningful for US models since they are (usually) modeled on specific gauges, unlike NEM specifications. It is organized by scale name, then gives all the different defined ratios for it, and then gives specs on each gauge used in the scale. I've tried to base this info on NMRA and NEM definitions first while including other national and corporate definitions.


KEY
N/A = Not Applicable
std = standard
def = definition
() = Alternate expression
Y = model in Y scale of a North Am. standard gauge RR with gauge of 56.5"
YnX.X  = model in Y scale of a North Am. narrow gauge RR with gauge of X.X'
[Y] = European model in Y scale of normal gauge RR (1250mm - 11700mm)
[Ym] = European model in Y scale of metric gauge RR (850mm - 1250mm)
[Ye] = European model in Y scale of narrow gauge RR (650mm - 850mm)
[Yi] = European model in Y scale of industrial gauge RR (400mm - 650mm)
??? = some information I can't find and would appriciate adding
^M = if this occurs ignore it (text conversion bug)
[] = European specifications
{} = UK specefications if different
++ = Japaneese specifications if different
\\ = French specifications if different
// = German specifications if different
|| = New Zeland specifications if different
^^ = Austraillian specifications if different   
* = NMRA defined value (without = derived value)
# = NEM defined value (without = derived value)
~ = Other (unknown source) defined value (without = derived value)
--------------------------------------------------------------------------


VI SCALE
  Accepted Scale:      1:5.5 or 55.4mm=1'
  STANDARD GAUGE VI
    Practiced Gauge:   ???
    Theoretical Gauge: 
    Made By:           ???


V SCALE
  Accepted Scale:      1:8 or 38.1mm=1'3 (???)
  STANDARD GAUGE V
    Practiced Gauge:   ??? (old def ~4-5/8" (4.625) 117mm)
    Theoretical Gauge: 7.063" 179.4mm
    Made By:           ???


IV SCALE
  Accepted Scale:      1:11 or 27.7mm=1' (old definition 1:20)
  STANDARD GAUGE IV
    Practiced Gauge:   2.95" ~75mm (old def 2.84" ~72mm, 2.95" ~75mm C-C)
    Theoretical Gauge: 5.13" 130.3mm
    Made By:           ???
  [INDUSTRIAL GAUGE IVi] (G GAUGE MODELLED ON EUROPEAN INDUSTRIAL GAUGE)
    Practiced Gauge:   1.77" ~45.00mm
    Made By:           ???


1" SCALE
  Accepted Scale:      {1:12 or ~1"=1' 25.4mm=1'}
  {STANDARD GAUGE 1"}
    Practiced Gauge:   4.87" (~4-13/16") 123.6mm
    Theoretical Gauge: 4.708" 120.0mm
    Made By:           ???


11/16" SCALE
  Accepted Scale:      {1:17.5 or 0.688"=1' (~11/16"=1') 17.5mm=1'}
  {STANDARD GAUGE 1"}
    Practiced Gauge:   3.25" (~3-1/4") 82.6mm
    Theoretical Gauge: 3.229" 82.02mm
    Made By:           ???


2-7/8" (GAUGE) SCALE
  Accepted Scale:      1:19.65 or 0.611"=1' 15.5mm=1'
  STANDARD GAUGE 2-7/8
    Gauge:             2.875" (2-7/8")
    Theoretical Gauge: N/A 
    Made By:           Lionel 1901-1905
                       McCoy (1950s)
                       Cohen (1970s)
                       T-Reproductions (RECENT)


III SCALE
  Accepted Scale:      1:16 or 0.750"=1' 19.1mm=1' (old defs 1:22, 1:23)
  STANDARD GAUGE III
    Practiced Gauge:   2.52" ~64mm (old def 2-5/8 (2.62)~67mm C-C)
    Theoretical Gauge: 3.531" 89.69mm
    Made By:           American Flyer ???
  NARROW GAUGE IIIn3 (uses I standard track)
    Practiced Gauge:   ??? (old def 1.77" 45mm)
    Theoretical Gauge: 2.625" 66.67mm
    Made By:           ???
  [NARROW GAUGE IIIe] (G GAUGE MODELLED ON EUROPEAN NARROW GAUGES)
    Practiced Gauge:   1.77" ~45.00mm 
    Made By:           ???
  NARROW GAUGE IIIn2.5 (used O std track)
    Practiced Gauge:   1.26" ~32mm
    Theoretical Gauge: 1.875" 47.63mm
    Made By:           ???


SM SCALE
  Accepted Scale:      1:19.1 or 0.630"=1' ~16mm=1'
  {METRIC GAUGE SM45}
    Practiced Gauge:   1.77" ~45.00mm
    Made By:           ???
  {NARROW GAUGE SM32}
    Practiced Gauge:   1.26" ~32.00mm
    Made By:           ???


II SCALE 
  Accepted Scale:      1:22.5 or 0.633"=1" 15.5mm=1' (old defs 1:27 1:28)
  STANDARD GAUGE II
    Practiced Gauge:   2.13" ~54mm (2.01" ~51mm) (old def 2.125" 54mm C-C)
    Theoretical Gauge: 2.511" (2.018") 
    Made By:           Magris
  [METRIC GAUGE IIm] (G GAUGE MODELLED ON EUROPEAN METRIC GAUGE)
    Practiced Gauge:   1.77" ~45mm (1.75" also used)
    Made By:           L.G.B.
  [NARROW GAUGE IIe]
    Practiced Gauge:   1.26" ~32mm
    Made By:           ???


G SCALE (US ONLY)
  Accepted Scale:      1:20.3 (1:24 also used)
  NARROW GAUGE G (LARGE SCALE OR G GAUGE OF US 3' GAUGE)
                 (uses 1 std track)
    Practiced Gauge:   1.77" ~45mm (1.75" also used)
    Theoretical Gauge: 1.791" (1.500")
    Made By:           L.G.B.
                       Kalamazoo
                       R.E.A. (1:29)
                       Lionel 1987-Present
                       Bachman
                       Delton
                       USA Trains
                       Aristo-Craft


"STANDARD" (GAUGE) SCALE
  Accepted Scale:      1:26.59 or 0.4513"=1' 11.5mm=1'
  STANDARD GAUGE "STANDARD" (THREE RAIL)
    Practiced Width:   2.125" (~2-1/8") 54.0mm
    Theoretical Gauge: N/A
    Made By:           Lionel 1906-1939
                       American Flyer (PRE-WWII)
                       Ives (PRE-WWII)
                       Cohen 1991-Present
                       T-Reproductions (RECENT)
                       Williams (1970s and 80s)
                       Classic Model Trains (RECENT)
                       Boucher


"WIDE" (GAUGE) SCALE
  Accepted Scale:      1:28.25 or 0.4247'=1' 10.8mm=1'
  STANDARD GAUGE "WIDE" (THREE RAIL)
    Practiced Gauge:   ~2.00" 50.8mm
    Theoretical Gauge: N/A
    Made By:           American Flyer (PRE-WWII)
                       Ives (PRE-WWII)
                       Dorfan (PRE-WWII)


I SCALE 
  Accepted Scale:      ~1:32 or 0.375"=1' 9.53mm=1' (old def 1:30)
                       {1:30.5 or ~10mm=1'}
  STANDARD GAUGE I (LARGE SCALE OR G GAUGE MODELED ON US STANDARD GAUGE)
                [I] (G GAUGE MODELLED ON EUROPEAN NORMAL GAUGES)
    Practiced Gauge:   1.77" ~45mm (old def 45.45mm, 1.89" 48mm C-C)
    Theoretical Gauge: 1.766"
    Made by:           Lionel 1987-Present
                       Bachman
                       Marklin
  NARROW GAUGE In2.5
    Practiced Gauge:   0.945" ~24mm
    Theoretical Gauge: 0.9375"
    Made By:           ???
  [NARROW GAUGE Ie]
    Practiced Gauge:   0.880" ~22.35mm


9mm SCALE
  Accepted Scale:      |1:33.9 or 0.345"=1' ~9mm=1'|
  |NORMAL GAUGE 9mm|
    Practiced Gauge:   1.26" ~32mm
    Made By:           ???


Q SCALE 
  Accepted Scale:      1:45 or 0.267"=1' 6.77mm=1'
  STANDARD GAUGE Q [0] (same as O std track)
    Practiced Gauge:   1.26" ~32mm
    Theoretical Gauge: 1.256"
    Made By:           ???


7mm SCALE
  Accepted Scale:      1:43.5 or 0.276"=1' ~7mm=1'
  [NORMAL GAUGE 7MM]
    Practiced Gauge:   33mm
    Made By:           ???


O SCALE (1/4" SCALE) (TECHNICALLY ZERO SCALE)
  Accepted Scale:      ~1:48 or 0.250"=1' 6.35mm=1'
                       [~1:45 or 6.773mm=1'] (US Q SCALE)
                       [ALSO 1:43.5 or ~7.00mm=1] 
                       {1:43.5 or ~7.00mm=1'} (ALSO OF SCALE)
                       \occasionally 1:43.5 or ~23mm=1m\
                       /1:43.5 or ~23mm=1m/ (0 MINITEX)
                       (old def 17/64" = 1')
  STANDARD GAUGE O (THREE RAIL)
                   O-27, O-42 (lighter weight with 27", 42", 54" curve diameter)
                   O, O-72 (heavier weight with 31", 54", 72" curve diameter)
                   SUPER O (realistic ties with 36" curve diameter)
                   (TWO RAIL) O
                   [0]
    Practiced Gauge:   1.25" (~1-1/4") 31.8mm [1.26" ~32mm] (old def 1.38" ~35mm)
    Theoretical Gauge: 1.177"
    Made By:           Lionel 1915-1942,1945-Present
                       K-Line (RECENT)
                       Bing (PRE-WWI)
                       Ives 1910-1931
                       Marx 1938-1975
                       Dorfan (PRE-WWII)
                       American Flyer ~1918-1941
                       Right-Of-Way
                       Kusan (1950s)
                       Atheran (POST-WWII)
                       Williams (RECENT)
                       Hodge (POST-WWII)
                       MTH (RECENT)
                       3rd Rail (RECENT)
                       Red Caboose (RECENT)
                       Weaver (RECENT)
  STANDARD GAUGE (TWO RAIL) PROTO:48
    Practiced Gauge:   1.688" (~1-11/16") 42.9mm or ~1.17"
    Theoretical Gauge: 1.177"
    Made By:           Weaver
                       Williams
                       Red Caboose
                       Right-of-way
                       Overland Models (expensive brass in small quanities)
                       Sunset Models
  NARROW GAUGE On4
    Practiced Gauge:   1.02" ~26mm
    Theoretical Gauge: 1.000" 25.40mm
    Made By:           ???
  NARROW GAUGE On3.5 [0m (uses S std track)]
    Practiced Gauge:   0.875" (~7/8") 22.4mm
    Theoretical Gauge: 0.8750"
    Made By:           ???
  NARROW GAUGE On3 (uses OO std track)
    Practiced Gauge:   0.750" (*3/4") 19.1mm
    Theoretical Gauge: 0.7500"
    Made By:           ???
  NARROW GAUGE On2.5
    Practiced Gauge:   0.609" (~39/64") 15.5mm
    Theoretical Gauge: 0.6250" 
    Made By:           ???
  [NARROW GAUGE 0e] /0 MINEX/
    Practiced Gauge:   0.650" 16.5mm
    Made By:           Fleishmenn
                       Maerklin
  NARROW GAUGE On2
    Practiced Gauge:   ~0.500" 12.7mm
    Theoretical Gauge: 0.5000" 12.7mm
    Made By:           ???
  NARROW GAUGE On1.5 (uses N std track)
    Practiced Gauge:   0.354" ~9mm
    Made By:           ???


I0M SCALE
  Accepted Scale:      {1:55 or 0.218"=1' ~5.5mm=1'}
  {NORMAL GAUGE I0M}
    Practiced Gauge:   0.472" ~12mm
    Made By:           Gem IOM


Fn3 SCALE
  Accepted Scale:      {1:55.5 or 0.216"=1' ~5.5mm=1'}
  {NORMAL GUAGE Fn3}
    Practiced Gauge:   0.650" ~16.5mm
    Made By:           ???


S SCALE (H1 SCALE)
  Accepted Scale:      1:64th or 0.1875"=1' 4.76mm=1'
  STANDARD GAUGE S [S] (C-D GAUGE)
    Accepted Gauge:    0.885" (7/8") 22.4mm    
    Theoretical Gauge: 0.8828"  
    Made By:           American Flyer 1945-1968;1979-Present
                       American Models (RECENT)
                       Cleavland Manufacturing 1930s
  |NORMAL GAUGE S 5.5|
    Practiced Gauge:   ???
    Theoretical Gauge: 1.03" 26.2mm
    Made By:           ???
  [NARROW GAUGE Sm] |Sn3.5| (uses HO std track)
    Practiced Gauge:   0.560" ~16.5mm
    Made By:           ???  |NARROW GAUGE Sn3.5|
    Practiced Gauge:   0.563" (9/16") 14.3mm
  NARROW GAUGE Sn3 
    Practiced Gauge:   0.563" (9/16") 14.3mm
    Theoretical Gauge: 0.5625" 14.29mm
    Made By:           P-B-L
  NARROW GAUGE Sn2.5 
    Practiced Gauge:   0.469" (~15/16) 11.9"
    Theoretical Gauge: 0.4688"
    Made By:           ???
  [NARROW GAUGE Se] (uses TT std track) 
    Practiced Gauge:   0.472" 12mm     
    Made By:           ???
  NARROW GAUGE Sn2 (uses N std track) 
    Practiced Gauge:   0.354" (~3/8") 9.52mm     
    Theoretical Gauge: 0.3750"
    Made By:           ???


TABLE TOP SCALE (_NOT_ TT)
  Accepted Scale:      [???]
  [NORMAL GAUGE TABLE TOP]
    Practiced Gauge:   0.625" (~5/8") 15.9mm
    Made By:           Bing 1921-1934


4mm SCALE
  Accepted Scale:      [1:76 or 0.1579'=1' ~4.00mm-1']
  [NORMAL GAUGE 4mm]
    Practiced Gauge:   0.354" ~9.00mm (16.5mm)
    Made By:           ???


P4/S4 SCALE
  Accepted Scale:      {1:76.2 or 0.1579'=1' ~4.00mm=1'}
  {NORMAL GAUGE P4}
    Practiced Gauge:   0.741" ~18.82mm (18.88mm also)
    Made By:           ???


EEM SCALE
  Accepted Scale:      {1:76 or 0.1579'=1' 4.00mm=1'}
  {NORMAL GAUGE EEM}
    Practiced Gauge:   ~18.88
    Made By:           ???


EM SCALE 
  Accepted Scale:      {1:76 or 0.1579'=1' 4.00mm=1'}
  {NORMAL GAUGE EM}
    Practiced Gauge:   0.709" 18mm (18.2 also used)
    Made By:           ???


OO SCALE
  Accepted Scale:      1:76 or 0.1579"=1' ~4.00mm=1'
                       [1:91 or 0.132"=1' 3.35mm=1' or ~1.1mm=1m] 00E
                       (also 3.5mm = 1")
                       {1:76.2 or 0.157"=1' ~4.00mm=1'}
  STANDARD GAUGE OO 
    Practiced Gauge:   0.750" (*3/4") 19.1mm (prewar def 0.748" ~19mm) 
    Theoretical Gauge: 0.7434"
    Made By:           Lionel 1938-1942
                       Scalecraft (1930s)
                       Nason (1930s)
  [NORMAL GAUGE 00]
    Practiced Gauge:   0.748" ~19mm 
    Theoretical Gauge: 0.7434"
    Made By:           ???
  [NORMAL GAUGE 00]
    Practiced Gauge:   0.650" ~16.5mm
    Made By:           Hornby
                       Lima
  {BROAD GAUGE OO}
    Practiced Gauge:   1.102" ~28mm
    Made By:           ???
  {NARROW GAUGE OO9 (OOe)} (uses N standard track)
    Practiced Gauge:   0.354" ~9mm
    Made By:           ???



HO SCALE
  Accepted Scale:      1:87.1 or 0.138"=1' *3.50mm=1'
                       [1:87 or ~3.50mm=1' (1:90 also)]
                       {1:76.2 or ~4.00mm=1" (also 3.5mm = 1')}
  STANDARD GAUGE HO [H0]
    Practiced Gauge:   0.650" ~16.5mm                                
    Theoretical Gauge: 0.6487"
    Made By:           Atheran
                       Roundhouse
                       Tyco
                       Life-Like
                       A.H.M.
                       Lionel 1957-1966;1974-1977
                       Bachman
                       Maerklin
                       Bing
                       Bowser
                       Atlas
                       Walthers
                       Atheran
                       Varney
                       Mantua
                       Trix
                       Fleishmenn
                       Roco
                       Lima
                       Rivarossi
                       Kato
  ^NORMAL GAUGE HO5.5^
    Practiced Gauge:   0.728" 18.5mm
    Made By:           ???
  [NORMAL GAUGE H0E]
    Practiced Gauge:   0.630" ~16mm
    Made By:           ???
  NARROW GAUGE HOn4 (uses custom track)
    Practiced Gauge:   0.551" ~14mm
    Theoretical Gauge: 0.4822"
    Made By:           ???
  NARROW GAUGE HOn3.5 [HOm] (uses TT std track)
    Practiced Gauge:   0.472" ~12.0mm
    Theoretical Gauge: 0.4592"
    Made By:           Bemo
  NARROW GAUGE HOn3
    Practiced Gauge:   0.413" 10.5mm
    Theoretical Gauge: 0.4133"
    Made By:           ???
  [NARROW GAUGE HOn900]
    Practiced Gauge:   0.407" ~10.33mm
    Made By:           ???
  [NARROW GAUGE HOn800]
    Practiced Gauge:   0.361" ~9.18mm
    Made By:           ???
  NARROW GAUGE HOn2.5 [HOe] (uses N std track)
    Practiced Gauge:   0.354" ~9.00mm
    Theoretical Gauge: 0.3444"
    Made By:           Bemo
  NARROW GAUGE HOn2 
    Practiced Gauge:   0.276" ~7.00mm (~9/32" also used)
    Theoretical Gauge: 0.2755"
    Made By:           ???
  [NARROW GAUGE HOn600]
    Practiced Gauge:   0.271" ~6.88mm
    Made By:           ???
  [NARROW GAUGE HOi (HOz)] (uses Z std track)
    Practiced Gauge:   0.256" ~6.50mm
    Made By:           Gerald of Austria
  NARROW GAUGE HOn1.5 
    Practiced Gauge:   0.157" ~4mm
    Theoretical Gauge: 0.2067"
    Made By:           ???


E SCALE
  Accepted Scale:      ~1:96 0.125"=1' (~1/8"=1') 3.18mm=1'
  STANDARD GAUGE E
    Practiced Gauge:   0.594" (~19/32) 15.1mm
    Theoretical Gauge: 
    Made By:           


QO SCALE
  Accepted Scale:      ~1:96 0.125" (~1/8"=1') 3.18mm=1'
  STANDARD GAUGE QO
    Practiced Gauge:   ~0.600" 15.2mm
    Made By:           ???


OOC SCALE
  Accepted Scale:      [~1:100 or 0.120"=1" 3.05mm=1"]
  [NORMAL GAUGE 00C]
    Practiced Gauge:   0.563" ~14.3mm

3mm SCALE
  Accepted Scale:      {1:101.6 or 0.118"=1' ~3.00mm=1'}
  {NORMAL GAUGE 3mm}
    Practiced Gauge:   0.559" ~14.2mm
    Made By:           ???


TM SCALE (version of TT)
  Accepted Scale:      {1:101.6 or 0.118"=1' ~3.00mm=1'}
  {NORMAL GAUGE TM}
    Practiced Gauge:   0.0531" ~13.5mm
    Made By:           ???


TT3 SCALE (version of TT)
  Accepted Scale:      {1:101.6 or 0.118"=1' ~3.00mm=1'}
  {NORMAL GAUGE TT3}
    Practiced Gauge:   0.472" ~12mm
    Made By:           Tri-Ang
                       Peco
                       


TTX SCALE (version of TT)
  Accepted Scale:      {1:108 or 0.111"=1' [2.82mm=1']}
  {NORMAL GAUGE TTX}
    Practiced Gauge:   0.472" ~12mm
    Made By:           ???


TT SCALE (TABLETOP)
  Accepted Scale:      1:120 or ~0.100"=1' 2.54mm=1'
                       [1:120 or 0.100"=1' 2.54mm=1']
                       |~1:120 or 0.100"=1' 2.54mm=1'|
  STANDARD GAUGE TT [TT]
    Practiced Gauge:   0.472" [~12mm]
    Theoretical Gauge: 0.4708"
    Made By:           Tillig
                       HP Products
                       Arnold
                       Roco
                       Coastal Engineering
                       The Sign
                       Kato
                       TILLIG
  [METRIC GAUGE TTm]
    Practiced Gauge:   9mm
    Made By:           ???
  NARROW GAUGE TTn3 (uses custom track)
    Practiced Gauge:   0.295" 7.5mm
    Theoretical Gauge: 0.3000"
    Made By:           ???
  [NARROW GAUGE TTe]
    Practiced Gauge:   0.236" ~6.5mm
    Made By:           ???


OOO SCALE (2mm SCALE)
  Accepted Scale:      1:148 or 0.081"=1' 2.06mm=1'
                       {1:152.4 or 0.0787"=1' ~2.00mm=1'}
  STANDARD GAUGE OOO
    Practiced Gauge:   9.42mm
    Theoretical Gauge: 0.3818"
    Made By:           ???
  {NORMAL GAUGE 000}
    Practiced Gauge:   0.354" 9.0mm
    Made By:           ???


MINITRIX SCALE
  Accepted Scale:      [~1:150 or 0.080"=1' 2.03mm=1']
                       [Also ~1:200 or 0.060"=1' 1.52mm=1"]
  [NORMAL GAUGE MINITRIX]
    Practiced Gauge:   0.354" ~9.00mm
    Made By:           Arnold 1960s
                       ??? 1950s


2mm SCALE
  Accepted Scale:      [1:152.4 or ~2.00mm=1']
  [NORMAL GAUGE 2mm]
    Practiced Gauge:   0.374" 9.50mm (9.42 also ?)
    Made By:           ??? 


N SCALE
  Accepted Scale:      ~1:160 or 0.075"=1' [1.90mm=1']
                       {1:148 or ~2-1/16mm=1'}
                       [1:148 or ~2-1/16mm=1 (also 1:160)]
                       +~1:150 or 2.03mm=1'+
                       |~1:160 or 1.91mm=1'|
  STANDARD GAUGE N [N]
    Practiced Gauge:   0.354" ~9mm
    Theoretical Gauge: 0.3531"
    Made By:           Arnold
                       Fleischmann
                       Roco
                       Trix
                       Lima
                       Kato
                       Atlas
                       Model Power (Kadee)
                       Con-Cor
  NARROW GAUGE Nn3 [Nm] |N-NZR| (uses Z std track)
    Practiced Gauge:   0.256" ~6.5mm
    Theoretical Gauge: 0.2250"
    Mady By:           ???


HH(O) SCALE
  Accepted Scale:      1:174 or 0.0620:=1' (~1/16"=1') 1.59mm=1"
  STANDARD GAUGE HH(O)
    Practiced Gauge:   0.313" (~5/16") 7.94mm
    Made By:           ???


K SCALE
  Accepted Scale:      [~1:180 or 0.0667'=1" 1.69mm=1']
  [NORMAL GAUGE K]
    Practiced Gauge:   0.315" ~8.00mm
    Made By:           ???


QOO SCALE
  Accepted Scale:      ~1:192 or 0.0625"=1" (~1/16'=1") 1.59mm=1'
  STANDARD GAUGE QOO
    Practiced Gauge:   ~0.300" 7.62mm
    Theoretical Gauge: 0.294" 7.47mm
    Made By:           ???


Z SCALE
  Accepted Scale:      ~1:220 or 0.055"=1' 1.39mm=1'   
  STANDARD GAUGE Z [Z]
    Practiced Gauge:   0.256" ~6.50mm
    Theoretical Gauge: 0.2568" 
    Made By:           Maerklin


TTT SCALE
  Accepted Scale:      ~1:240 or ~0.050"=1" 1.27mm=1"
  STANDARD GAUGE TTT
    Practiced Gauge:   ~0.236" 5.99mm
    Made By:           not made


M SCALE
  Accepted Scale:      1:300 or 0.040"=1' 1.02mm=1'
  STANDARD GAUGE M [M]
    Practiced Gauge:   0.197" 5mm
    Theoretical Gauge: 0.1883" 
    Made By:           ???


X SCALE
  Accepted Scale:      {1:304 or 0.0394'=1' ~1.00mm=1'}
  {NORMAL GAUGE X}
    Practiced Gauge:   0.187" (~3/16") 4.76mm
    Made By:           R Walkely 1935


HZ SCALE
  Accepted Scale:      /~1:440 or 0.0273"=1' 0.693mm=1"/
  /NORMAL GAUGE HZ/
    Practiced Gauge:   0.128" ~3.25mm
    Made By:           Railex 1992


? SCALE
  Accepted Scale:      {~1:480 or 0.0250:=1' 0.635mm=1'}
  {NORMAL GAUGE ?}
    Practiced Gauge:   0.125" (~1/8") 3.18mm
    Made By:           ??? 1970s

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