At this time the train being pulled by Rocket approached on the other line. Rocket was being driven by Joseph Locke, George Stephenson's assistant and future eminent engineer in his own right. A shout went up, "An engine is approaching. Take care, gentlemen!" The other disembarked passengers either climbed back into their seats, or stepped over the northern line and completely out of the way. A third option was available, to stand with one's back to the stationary coaches, as there was a four-foot gap between the lines, and even though the Duke's private carriage was wider than a then-standard carriage, it would have still been possible to stand between the stationary train and the travelling train and remain safe. However, what unfolded was a calamitous series of events. Huskisson was known to be clumsy, and had endured a long list of problems from his regular trips and falls; he had twice broken his arm and never fully recovered the use of it. Added to this, he was only a few weeks post surgery and was present against his doctor's advice.