Greater Greater Washington today discusses bicycles on commuter rail, pointing out that MARC is one of only two commuter rail operators in the US not to allow non-folding bikes in their system. Near the end of the piece GGW mentions CalTrain’s bike cars as one progressive solution to the problem. Like airport buses outfitted to carry lots of luggage, the bike cars are outfitted to make bike storage easy.
I rode CalTrain earlier this year and took some pictures of the bike car on my train. Here they are: