Posted by E.Glorg on March 27, 2020 
"Pionerka" is nickname of TD-5U (ТД-5У) AFAIK (and the one pictured seems to be just of that model)
Posted by Ilya Semenoff on March 28, 2020 
Yes, you are right! But In nowadays "Pionerka" is nickname not only of TD-5U but of all similar selfmade motor railcars.
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