Until recently there was a big sign hanging on one wall in the street-level area under the Main Street Train Station. Labeled the Magic Kingdom Travel Guide, it provided a graphical representation of the WDW Railroad's stops.
I assume one of the driving reasons to remove it was that there no longer is a stop for Mickey's Toontown Fair.
Now, there are signs honoring the trains Lilly Belle and Walter E. Disney. They match the signs on the other side of the breezeway (which refer to the trains Roy O Disney and Roger E. Broggie). These are the four trains at the MK.
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Kevin Yee is the author of numerous independent Disney books, including the popular Walt Disney World Earbook series and Walt Disney World Hidden History.