Farish black5 tender pick up removal query

Hi,

Just a quick query, if I cut the wire to the tender on the farish black 5 should it still run with only the loco pick ups on the main wheels. I've trialled running the engine on track and lifting the tender of the rails and the engine was still moving. However before I cut anything I said I would just check.

I purchased it to use the chassis for a new Hunslet however unlike the older black5 model I used, that was only loco powered, with no pickup/wire from the cab to tender.

Thanks in advance