My current collection

Lastly, I got this C11 171 locomotive. Not sure what wagons originally came with this, as it was only the locomotive that was for sale.

But you'd like me to tell you, right?

The green headmark visible in your last picture bears the text 函館大沼号, Hakodate Onuma. This was a steam-hauled train operated by JR Hokkaido that ran on the Hakodate Line during holidays and festivals in the period 2001 to 2014, sometimes as a double-header with C11 171 and C11 207. Also a DE10 was sometimes hitched to the other end to haul the train back in the other direction.

Plarail have released C11 171 Hakodate Onuma twice, firstly in December 2002 representing JR Hokkaido in the "My Home Town's Train" series, with two purple/brown coaches, one of which has the same headmark on the rear end:

https://youtu.be/HHOOG1RopnI?si=RnHqsoskvXzcDb09

....and then in 2006 as one of the limited edition items at Plarail Expo, this time with a blue coach and an un-powered blue DE10 1690:

https://www.youtube.com/watch?v=01_dbJ2rd_U

The box for the 2002 version says Made in Thailand, while the 2006 version says the C11 component is Made in China, but in fact the chassis says Made in Thailand on both of them.

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Oops, Super beat me to it. Never mind!