Station Stop Module SSDC1

BLOCKsignalling SSDC1 

DC Station Stop Module with Smooth Deceleration and Acceleration

 

  • Detects trains approaching the station and smoothly slows it to stop at the platform
  • After a delay, the train smoothly acellerates away from the platform
  • Reed relays can optionally be connected to set the stopping point
  • Operates for trains arriving from both directions
  • Several built-in programs with the option to change all settings to suit

 

Our new station stop module connects to an isolated section of track adjacent to the station platform and detects trains arriving from either direction.

When a train is detected, the module automatically reduces the track voltage to slow the train and stop it at the platform. It can be chosen that all trains stop, trains only from one direction stop, only a proportion of trains stop, or trains randomly stop.

The stopping point at the platform can be chosen using one of several simple methods detailed below.

The train waits at the station for a set delay, and the smoothly accelerates away. The waiting time can be selected to be a fixed delay or can be random.

Optional reed switches can be connected to set precise stopping points (for either direction) or to set trains to smoothly decelerate as they approach the station, and to switch to a crawl speed alongside the platform before finally stopping.

Several built in presets allow you to quickly configre the module, whilst providing full flexibility to tailor the module to best suit your layout.

 

Power Supply

The module is powered by the track supply, and can be either connected to the track, or directly to the output of the Controller.

Note terminal T1 on the module must be connected to the continious rail, and terminal T2 is connected to the rail with track breaks either side of the station.

Reed Relays and magnets 

 

Default Operation

As supplied, the module runs a basic program so familiarity can be gained.  For some layouts, this operation will be perfectly suitable, and be all that is needed to obtain a fully functioning, realistic station stop, particularly if trains are operated only in one direction.

The module is designed to monitor the isolated section of track for approaching trains from either direction.

When a train is detected entering the section, it is slowed in two stages. 

Firstly it is slowed to approximately 25% of full speed over a period of 2 seconds.

Then as it exits the isolated section, it slows to a standstill over 4 seconds.  It travels a comparitively short distance in this time.

After a 15 second waiting time, the train accelerates smoothly away from the platform.

 

For trains running in only one direction on the track, the first rail break can be chosen some distance before the start of the platfrom.This means that the initial deceleration can commence before the train reaches the platform.  The second track break determines the final stopping point and would be just before the end of the platform if DMUs are bing run, or perhaps just after if steam locos are being operated.

When trains are running in both directions, then there may need to be some compromises.  Both track breaks will need to be near the end of the platform, meaning that most of the deceleration takes place as the train becomes level with the platform.   Even with this simple setup, several changes can be easily made to provide fully realistic operation.

Using the settings below, it is possible to vary this default program significantly to alter its operation.  For instance, it is possible to adjust the the time after entering the isolated section, before commencing the initial deceleration, the rate of initial deceleration, the finshing speed after the initial deceleration, the rate of the final deceleration before coming to a standstill, the waiting time, whether train from both direction are stopped, whether the waiting time is fixed or random, whether all trains, or only a proportion stop, and so on.

 

Connecting Reed Relays

Whilst the simple arrangement above can provide fully realistic operation for trains travelling in only one direction, and perfectly acceptable opersation for trains travelling in both directions, improvements in the accuracy of the stopping position can be achieved by addin a reed relay below the track and mounting a magnet under the train.

By positioning the magnet central under the train, and the reed relay central along the platform, the whole train will now stop in the centre of the platform irrespective of its approach direction.

The initial stage of deceleration commences when the train enters the isolated section of track (which can now be some distance before the station), before slowing to a crawl whilst passing the platform edge.  The train will finally stop when it is central the the platform.

The magnet needs to be located centrally along the whole length of the train.

DC Shuttle Module Wiring Diagram 

 

Model Railway Shuttle 

If locomotives already have magnets fitted for other reasons (ie block detection) or it is desired to only fit magnets to locos as carriages are often changed, then two reed relays can be fitted, one at each end of the platform.

In this case, the module waits for both reed relays to be switched before stopping the train.

Smooth Acelleration & Deceleration 

 

Reed Relays and magnets