DCCWiki, a community DCC encyclopedia.
| DCC Terms
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| DCC Components
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Accessory Decoder, Auto Reverse, Command station, Computer Interface, Consists, DCC Booster, DCC Ready, Decoder, Digital packet, How DCC works, Multifunction Decoder, Power supply, Speed steps, Throttle, XPressNet
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| General
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Address Partitioning, Ammeter, Analog Control of Model Railroads, Bus, Cab, Can Motor, Command Control, Coreless Motor, DCC, DCC in a Box, DMM, Distributed Power, Frog Juicer, Jump Port, LCC, Layout Command Control, Locomotive, MU consisting, Motor, OEM, Phase, Power Bus, Programming Track, Pulse Width Modulation, Rail Size, Serial User System Interface - SUSI, Slots, Standard Dimensions, Turnout Motors, Turnouts with Digital Command Control, Voltage Drop, Zero Stretching
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| Mobile decoder
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Analog Conversion, Back EMF, Decoder Connection Method, Decoder-Assisted Consisting, Digitrax Transponding, Ditch Lights, Dither, Energy Storage, FX Lighting, Functions, High-Frequency Decoders, Kick Start, Lighting Effects, Loco Momentum, Locomotive Interface, NMRA Connector, NMRA DCC Plug for Multifunction Decoders, Power Conversion, Programming Lock, Programming Modes, Quartering, Silent Drive, Snood, Speed Table, USP, XOR
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| Non-DCC
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Primary DCC Components
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| Short Definition
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Dimensions that determine clearances between tracks, structures, platforms, etc.
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The table below is clearance and dimensional information that you may find useful to have around. G scales have been split up into F, G, and A for better accuracy.
| Standard Clearances, American Practice
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| Scale
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Prototype
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F
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G
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A
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#1
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O
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S
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H0
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N
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Z
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| Ratio, 1:
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1
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20.3
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22.5
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29
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32
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48
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64
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87.1
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160
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220
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| Track Centers
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9.5
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8.5
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6
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6
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4
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2.75
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2
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1
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1
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| Track Centers, double curved trackage
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10
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10
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9
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9
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6
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4.13
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3
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1.5
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1
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| Overhead Clearance
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22
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13.0049
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11.7333
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9.1034
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8.25
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5.50
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4.125
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3.0310
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1.65
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1.2000
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| Minimum Clearances, Track Center to Structures
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8
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4.7291
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4.2667
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3.3103
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3.00
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2.00
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1.500
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1.0222
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0.60
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0.4364
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Notes:
The track centers for double track on curves was derived from NMRA straight track practices. Refer to the NMRA Standards for more detailed information, as clearances are related to degree of curvature.
All dimensions are in inches, except those for the prototype, which are presented in Feet.
For more detailed info please refer to the NMRA Standard S8 Track Centers.
Also see the NMRA RP-2 Standards Gauge. Good trackwork which meets the standard, and checking wheelsets and clearances with the gauge, will reduce derailments and other tracking problems.