COST ANALYSIS:
Lionel part # 691FTSWB01 PCB / Receiver / Fastrack Switch / TMCC $18.60
Lionel part # 691TRC4A01 PCB / Motor Driver / Fastrack Switch / TMCC $23.00
Lionel S/H $9.00 to Maryland.
E-Bay part # JST 2.0 PH8-Pin ( Female connector with leads + unneeded male connector) 10 for $8.99
E-Bay part # JST 1.5 ZH 5 Pin ( Female connector with leads + unneeded male connector) 10 for $6.49 [JST 1.5 ZH 6 PIN if converting using old Motor Driver PCB]
E-Bay S/H included free.
Digikey.com part # 679-2386-1-ND Switch Tactile SPST-NO $0.71
Digikey.com S/H $2.86 to Maryland.
Heat Shrinkable tubing and lead free solder.
5 minute Epoxy (To install the push button programing switch).
So, about $70 to do ONE switch plus cost of heat shrinkable tubing, epoxy, and solder.
I did FOUR switches for about $49 each plus the cost of heat shrinkable tubing, epoxy, and solder.
You save money on Lionel S/H and the JST connectors buy doing more than one switch. But......read on to the end of this thread. The price is going down WAY down. 
