Because Super Train Megazord/Whatever it was called in GoGoV.
Nothing to do with rescue, but "It looked cool."

If we go by that rule, let's make MagiShine a rescue hero too. xDDD

Don't forget Go-on Red! He had a mammoth train :)

Super Train gets lumped in with rescue because it was in a rescue series :p

Super Rescue/Grand Liner at least was transproting the other Vehicles so its fits better than a bunch of normal trains that are not quipped to deal with rescue situations in the slightest :lol

Car Carrier Ressha. Fire Ressha. Police Ressha. That's enough rescue for Toqger xD

I think carranger could had a sixth member called black racer.VRV master don't count.

You mean like Signalman?
EDIT: Not as a sixth ranger- Zordon knows we don't need that argument again- but as another member

Signalman is not a member is a extra hero just like VRV master.

Trains aren't as widely popular in the U.S. like they are in Japan due to America being more about cars and busses for transit than trains.

Sure there are plenty of people who frequently use trains for transit (NYC's happening subway system anyone?) but if you want to go from Raleigh to Seattle, you're probably gonna fly there instead of taking a train.

A shame really. Trains are fantastic.