Zelgadis considers for a moment, then starts to work, creating patches of ice and frost on the platform spelling out HELP. They aren't in immediate danger, but it's a good universal signal. And the train can translate written language.

It's a small amount of magic, but repeated castings does cause Zelgadis to take a breather after that. "It'll probably melt in hours, but if the train has some sense of magic, it might observe that even if it doesn't see the letters themselves. I'm tempted to start throwing spells at the train if this doesn't work."

After he catches his breath. His magic reserves weren't what they were.