One railway sleeper on its own can be heavy to move around. (120 - 220 lbs) It can trap or break fingers, bruise feet and particular care needs to be taken. Many lorry drivers and workers with railway sleepers have permenantly scarred hands or deformed fingers from being crushed by railway sleepers. Take special care when you move or stack sleepers. Wear gloves and serious footware. Be clear with your carrying partner who is lifting first etc. Really concentrate and use correct lifting procedures.