in abutment with the latching device 3 the spear 11 extends axially into the first passage 12 in block 13 toward an air inlet port 36 two angled second passages 37 and 38 traverse the path of the first passage 12 as shown the spear 11 has a frusto conical leading point 39 followed by a portion 40 of reduced diameter which then tapers outwardly again passages 37 and 38 each have an independent locking pin assembly the locking pin 15 disposed in passage 37 forms the operating latch and the second locking pin 41 in passage 38 is the stabling latch which is engaged when the train is not in use the locking pins 15 and 41 in both cases comprise a rod having an approximately central portion of reduced diameter with a taper 42 at each end thereof seals are effected between the pins and passages by use of o rings in the usual manner the operating latch has a coil spring 43 seated in a blind hole in the uppermost part of the pin 15 connector blocks 44 and 45 are provided in sealing engagement with block 13 connecting air ports 46 and 47 to passage 37 and air ports 48 and 49 to passage 38 the spring 43 extends upwardly through passage 37 into block 44 to connect with air port 47 thereby biasing the locking pin 15 in the downward unlatched position as.