used when only a single rail is available to support chassis 2 along the track bed in the presence of two rails wheels 3 are engaged and cylinder 5a lifts crawler mechanism 5 clear of the rail continuing to advert to fig1 the device is shown to further include bulk feeder bin 6 used to store a supply of wooden tie plugs not shown conveyer 7 is shown to extend from the internal portion of bulk feeder bin 6 out and into a centrifugal feeder 8 centrifugal feeder 8 is connected to a supply tube 9 adapted to receive and deliver wooden tie plugs from bulk feeder 8 to insert gun 11 positioned over a railroad tie opening spike hole 25 the device further includes a tie sensing mechanism 10 adjacent the insertion gun 11 for automatically and precisely positioning the insertion gun 11 over spike hole 25 for later insertion of a wooden tie plug bazooka tube 12 is interposed between centrifugal feeder bin 8 and supply tube 9 and is adapted to accept a single wooden tie plug at a time for stacking within the supply tube and later insertion continuing to advert to fig1 supply tube 9 is shown to terminate at its lower end in insertion tube 13 adapted to accept a limited number of oriented tie plugs that are later interposed within insertion slot 15 through the use of a horizontal positioning ram 14 once in place in insertion slot 15 ram 16 is automatically engaged to vertically shoot the tie plug into spike hole 25 the specific features of the insertion mechanism and device are discussed in more detail below adverting next to fig2 an.