Module Specifications

 

Where all tracks lead to railway friends

 

When PMT was started, it was decided to use HO scale, 16.5mm gauge. It was also decided that the club would be modular, i.e.. make use of standard sized 'tables' with tracks entering and leaving at fixed points.  This works very well, and is a popular way for clubs to build big layouts. As time went by modules were bought by the club. This however led to high maintenance cost to repair and maintain the modules. It was therefore decided to go back to the original concept of every member, who is interested, owns his own modules. The size was reduced to 1200mm in length to make it possible to fit inside a normal passenger car. The standards were changed slightly and can be found below.

MODULES SPECIFICATION
New HO Gauge module standards

Modules should be built according to the following set standards or can be bought from the club:

  • 1200mm long by 600mm wide (See Fig 1)
  • Adjoining modules will be clamped together by means of U profile which incorporates clamps. These U profiles will also be used to accommodate feet of the modules. These will be supplied by PMT.
  • Sides to be kept clear of any fixtures except pockets on corners.
  • Height of the sides of the modules must to be 100mm top to bottom.
  • Thickness of the wood is 12mm pine ply.
  • 1 cross braces has to be added in centre of modules for solid top modules. If top is extruded polystyrene then 2 braces have to be used.
  • The legs are made from 25m square steel tubing with an adjustable 10mm threaded socket in the top to adjust the height as needed and a cap on the bottom. These will be supplied by the club when erecting at exhibitions.
  • Facia's are to be added to front of module starting 25mm from the bottom. Height above module to be a minimum of 20mm. 25mm below facia is used for green curtain which are supported by curtain spring with eye hooks on screws. (Obtainable from PMT at a fee)
  • Corner modules will be 90 degree units with an outside track radius of 36 and inside radius of 34. These will be supplied by PMT.
  • There is no height limit to the modules (multiple layers are encouraged) modules have to fit through a 700mm by 2000mm door frame.

The scenery itself has to meet with certain standards, namely:

  • Double track mainline, the nearest known as the A-line (Front of module) and the other as the B-line. The A-line (Analogue) traffic runs right-to-left and the B-line (Digital) can be both directions.
  • There must never be any physical or electrical connection between the A-line and B-line.
  • The rail end is terminated by means of 2 Atlas Snap track #454 with 1.5mm ABS spacer under Snap track.
  • Peco code 100 nickel-silver rail has to be used on all main line track with no turnouts smaller than Peco medium radius leading from the mainline
  • Any code 100 nickel-silver flex (preferred) or track sections can be used on side lines.
  • The track has to be laid on a 5mm foam sub-roadbed or 5mm cork.
  • Ballast to be used where possible is Woodlands Scenics B89
  • A bus wire system must be used, wired into terminal blocks at both ends or as preferred. The bus is terminated with Male 2 way connector on A-line and Female 2 way connector on B-line on right of module and Female 2 way connector on A-line and Female 2 way connector on B-line on left side of module. This is seen from the front.
  • If the module requires power for automation or lighting, a fused transformer or power supply has to be mounted under the module, and standard 3 point mains plug on a reasonable length of cable is to be supplied. Power may NEVER be tapped from the tracks for any function.
  • The wiring has to conform the Club standards using purple, orange, white and green wires with purple the first rail and green the fourth rail from the front of the module
  • Everything between the termination tracks is left to the modeller's own initiative, subservient to the approval of the Club's Technical Committee
  • Clearances has to be high and wide enough to allow for the largest commercially made models in HO scale to traverse unrestricted
  • Over head wires are only used in exceptional cases and then only on the A-line
  • The module sides must be painted tennis court green
  • See attached drawings for further details. Module Drawings.
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