Track type vehicle power train

Claim 1

IN A VEHICLE POWER TRAIN THE COMBINATION COMPRISING; AN INPUT SHAFT; AN OUTPUT SHAFT; A ROTATABLE CARRIER; FIRST GEAR MEANS DISPOSED TO FORM A DRIVING CONNECTION BETWEEN SAID CARRIER AND SAID INPUT SHAFT AND INCLUDING CONTROL MEANS BY WHICH SAID FIRST GEAR MEANS IS SELECTIVELY OPERABLE FOR DRIVING SAID CARRIER; SECOND GEAR MEANS DISPOSED TO FORM A DRIVING CONNECTION BETWEEN SAID CARRIER AND SAID INPUT SHAFT AND INCLUDING CONTROL MEANS BY WHICH SAID SECOND GEAR MEANS IS SELECTIVELY OPERABLE FOR DRIVING SAID CARRIER; OUTPUT GEAR MEANS DISPOSED TO FORM A DRIVING CONNECTION BETWEEN SAID OUTPUT SHAFT AND SAID CARRIER AND INCLUDING CONTROL MEANS BY WHICH SAID OUTPUT GEAR MEANS IS SELECTIVELY OPERABLE TO DRIVE SAID OUTPUT SHAFT; CLUTCH MEANS SELECTIVELY OPERABLE TO CONNECT SAID CARRIER DIRECTLY TO SAID OUTPUT SHAFT; A SECOND INPUT SHAFT IN DRIVING CONNECTION WITH SAID OUTPUT SHAFT THROUGH GEARING LOCATED GENERALLY AT THE MID-POINT OF SAID SECOND INPUT SHAFT; A PAIR OF ROTATABLE CARRIERS EACH SURROUNDING ONE END OF SAID SECOND INPUT SHAFT; THIRD GEAR MEANS DISPOSED TO FORM A DRIVING CONNECTION BETWEEN SAID CARRIERS AND SAID SECOND INPUT SHAFT AND INCLUDING CONTROL MEANS BY WHICH SAID THIRD GEAR MEANS ARE SELECTIVELY OPERABLE FOR DRIVING SAID CARRIERS; FOURTH GEAR MEANS DISPOSED TO FORM A DRIVING CONNECTION BETWEEN SAID CARRIERS AND SAID SECOND INPUT SHAFT AND INCLUDING CONTROL MEANS BY WHICH SAID FOURTH GEAR MEANS ARE SELECTIVELY OPERABLE FOR DRIVING SAID CARRIER; AND A DRIVE SHAFT CONNECTED TO EACH OF SAID CARRIERS.