Another Hakko user here but I recently picked up a Weller Portasol butane powered iron for use at tracks with no electricity. I was really surprised by how quickly it heats and how well it worked even in windy conditions on big motor wires. Get the biggest one. Supposed to be equivalent to a 125 watt iron.

I'm keeping the Hakko on the workbench and using the Weller exclusively at the track.