As shown in the Lionel breakdowns, the FasTrack switches have extra circuitry for switch position illumination and uses a 4 conductor wire. As such, I don't immediately think they would be a good option for the 3 conductor tubular switches.
As for finding suitable switches, DigiKey and other similar electronic components providers have a great selection to choose from.
Just as an example, i filtered for the appropriate switches:
https://www.digikey.com/short/hf54qttb
Panel Mount, SPDT, Mom-Off-Mom, 24+VDC, 24+VAC, 5+Amp
Just about any one of those will work just fine for you.