Multiple axle self-steering powered locomotive truck

A powered railway truck adapted for use under the body of a locomotive, comprising:

• (a) truck framing including side frames having pairs of pedestal jaws for accommodating journal bearings of at least two axled wheelsets,
• (b) at least two axled wheelsets each comprising an axle and a pair of wheels fixed on its axle,
• (c) a pair of journal bearings for each axle, the journal bearings for each axle being received in a pair of pedestal jaws each having clearance providing freedom for yaw motion of the wheelsets with respect to the truck framing and with respect to each other,
• (d) means in the mid region of the truck framing for mounting the truck under the body of the locomotive comprising a truck swivel joint for interconnecting the truck framing with the body of the locomotive and providing freedom for swivel motion of the truck as a whole with respect to the body of the locomotiove about an upright swivel axis between the axled wheelsets,
• (e) at least one of the axled wheelsets being powered by a driving motor mounted thereon and having motor torque recation means connected to the truck framing, the motor torque reaction means being yieldable to accommodate yaw motion of the wheelset with respect to the truck framing,
• (f) a steering arm for each wheelset, each steering arm being connected with both of the journal bearings for the associated wheelset and movable therewith in yaw within the clearance provided in the associated pair of pedestal jaws, the steering arms being extended from the journal bearings into the central region between the wheelsets and between the sides of the truck,
• (g) abutment means in the region of the centerline of the truck for transmitting tractive force from the steering arm of any powered wheelset to the truck framing,
• (h) mechanism pivotally interconnecting the steering arms, including pivot means having an upright pivot axis in said central region between the wheelsets and between the sides of the truck and having means providing for relative yawing motion and means providing for relative rolling motion of the wheelsets with their respective steering arms, said pivot means being shiftably movable laterally of the vehicle independently of the vehicle body and independently of the truck framing,
• (i) and mechanism interconnecting each steering arm and the truck framing in the region between the wheelset and the adjacent end of the truck framing, each such mechanism including means providing restraint for relative movement of the steering arm and said adjacent end of the truck framing laterally of the truck, and further including means providing freedom for rolling motion of the steering arm with respect to the truck framing and for lateral shifting movement of the pivot means interconnecting the steering arms.