banksman

Etymology

bank + -s- + -man

noun

1. (UK, civil engineering) The person who directs the operation of a crane or larger vehicle from the point near where loads are attached and detached.
   It was signalled forward by a banksman and as it passed him at low speed, the amber lights on the level crossing illuminated, … The banksman was facing away from the crossing when signalling the lorry driver and did not notice the crossing's activation for about five seconds, … After being alerted by another member of staff, the banksman ordered the lorry to reverse as the barriers started to lower. January 2 2020, “Safety procedures addressed after Essex level crossing near-miss”, in Rail, page 15