Plarail TOMY Thomas NEW RELEASES

Might tick off owners of the light blue one because...isn't it a harder one to find as opposed to all the other color variations?

I'm not sure about the relative scarcity of the original seven different colour versions of the Keio 1000, but the Plarail Museum tells us that the light blue one was sold out / out of production in 2013, while the other six went on into 2014, so that makes sense.

Blue-Green, Salmon Pink, and Light Green were re-issued in January 2015, along with a new eighth colour - Orange Beige - and lasted into 2019/2020.

L-R: Light Green, Blue Green, Light Blue, Violet, Salmon Pink, Beige, Ivory White.
Orange Beige below.