How about a transit map? Yeah!
But I wouldn't be me without some background information first!
Mario City is the town surrounding the lake to the right. Above it is the small town of Pacifica, whose geothermal plants power Mario City. To it's left is Hilltop. Across the river to the south is East Port, the big town. Terraville is upriver, while Balboa city would be down to the right along the coast.
For some reason, the transit map is orientated with the west at the top of the map, and north to the right. To orient you better, the right end of the yellow line on the map is at the beaches in the north-east tip of Mario city. The central depot is at the south east corner of the lake, with the Hilltop and East Port express lines going toward the river or to Hilltop.
Here is the Central Depot. The elevated station serves the express lines to East Port and Hilltop. The platforms closest to the elevated station is for thru traffic, while the platforms closer to the street and ballpark are for special event and peak hour service, allow the trains to turn around.
The northern terminal of the blue line (the right of the map). The high-density housing and high school provide for plenty of transit clients!
Northern terminal of the yellow line.
Southern terminal of the blue line.
And, just for fun, back before there was anything much at all!