Sentence:  To reach their destination, the group had to go down from camp on <WSD>pump cars</WSD>, four miles by rail to Deep River; here they took boats to Svenson's Landing, two miles down the river and then walked the remaining six miles with the musicians carrying their instruments. 
Meaning of the word marked with <WSD> tags:  A light railroad car propelled by a hand-operated pumping mechanism; a handcar.