Definition of "backwards"

The length of the stoppages could not well be reduced; indeed, they are already too short if we are to believe the tale now current of a wandering Jew sort of passenger—a lady of advanced years who can only alight from a train backwards. Every time she begins to get out a porter rushes up crying "Hurry up, ma'am; train's going!"—and pushes her in again!

1944 May and June, “When the Circle was Steam Operated”, in Railway Magazine, page 150