The icon numbers are in the README but see below.
To make an armoured train:
- Open the Editor and load or create your terrain - be sure to add train tracks 
. 
- Buy your forces. I prefer to structure the train as one unit - sometimes two if it historicly operated in two sections so for a base unit, I will select a armour platoon with the right vehicle count. Note that if you want your train units to be able to fire indirect, you must select a base unit of the right class like SP Artillery. You can use the switch unit type button to change one PZ IV of a platoon to a Wespe then modify the Wespe to get an indirect capable unit.
 
- Deploy forces and build your train. Go to the deloy menu and set out your base unit some where convenient. Click on a vehicle and select the "change unit" button (sorry I don't have a copy of the game with me to give the right name) and change the values to represent the unit you are creating. The move must be "0". In the "Miscellaneous" section, you will be able to set the summer, winter and desert icons - at the moment I have only made Summer ones. Plug in the numbers below. Close the editor when you are done and voila - your new armoured train unit is on the map.
 Adjust placement and heading as required. 
Notes
- Some unit stats were included in the previous release. I will be working on more but always appreciate player input.
 
- Most armoured trains only had 1-2 cm of armour so with sloping  rating will usually be no more than 3. However some strange things do show up. The Polish Ti3 locomotive has about a 2 foot gap between the plating and the boiler - I estimate probably 2 points of steel armour plus 3+ points of additional heat for a rating of 2/5.
 
- Many armoured trains had a vast array of weapons - The Type II artillery car had 2 gun turrets 8 MG in the sides and ends and an AAMG in the top turret. However, most of these were casement mounted and could only fire to one side so one hack is to halve the numbers. The second turret weapon can be represented by using a no icon unit. In the current release use 3975. Position the unit under the non-rotating turret and change stats as before. You may want to split the total crew between the two to make each "half" a little less robust. Remember that Weapon slot 4 is for weapons with limited traverse like BMGs and main weapons like StuG guns. An AAMG in slot 4 will still fire 360 degrees.
 
Icon    Unit
3948    Locomotive
3949    Pursuit car Pzkw IV
3950    Gondola with 20mm flak
3951    Wooden flat car
3952    Gondola
3953    Passenger car
3954    Wooden Flat car with sand bags
3955    Captured Artillery car
3956    Gondola with 4x20mm flak (Whirblewind turret)
3957    T-38 tank carrying car
3958    Somua S-35 tank carrying car           30/06/06
3959    Panhard 38 (f) mit Funk                30/06/06
3960    Wooden flat with sandbags and infantry 30/06/06
3961    Gondola with infantry                  30/06/06
3962    Heavy Scout car Infantry               04/07/06
3963    Heavy Scout car with PzkwIV turret     04/07/06
3964    Flat car with repair supplies          05/07/06
3965    Polish Type II artillery 100px         06/07/06 revised 16/07/06
3966    Polish Tatra armoured drezya           07/07/06
3967    Light Scout car                        09/07/06
3968    Heavy Scout car with Flak              09/07/06
3969    Polish Ti3 locomotive 100px  
3970    Polish R drezyna Non-rotating turret
3971    Polish Tk drezyna
3972    Polish Tk-R-Tk drezyna set rotating turret
3973    Large flat (100px)
3974	Polish Assault car - Compromise Smierc size, Danuta profile.