For scraper conveyors operating under condition where floor undulations and 'snaking' are unavoidable it is common practice to drive from the opposite end to normal, This means that the drive is coincident with the onloading position, the aim being that the conveying side at the top becomes the slack side and tends more readily to maintain its sliding position on the trough base.
Typical example are run - of - mine coal scraper conveyors operating at the coal face under long-wall mining methods.