Worlds Largest Steam Locomotive Is Back!

for the locomotive that runs on a single track, yes.  

Have one to sell? Sell it yourself
Plarail Hyper Guardian Ekusugaina is probably the biggest.  it runs on 2 sets of tracks at the same time

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Well, I was referring to a regular Plarail but fair enough. If we go this rout then this Hyper Guardian that uses a double track and four engines to move it is pretty big and if we talk about big there is also the Big Thomas