Borgward IV The Borgward IV , officially designated " Schwerer Ladungsträger Borgward B IV " ( heavy explosive carrier Borgward B IV ) , was a German remote - controlled demolition vehicle used in World War II . Design . During World War II , the " Wehrmacht " used three remotely operated demolition tanks : the light Goliath ( " Sd . Kfz . 302 / 303a / 303b " ) , the medium Springer ( " Sd . Kfz . 304 " ) and the heavy Borgward IV ( " Sd . Kfz . 301 " ) . The Borgward IV was the largest of the vehicles and the only one capable of releasing its explosives before detonating ; the two smaller vehicles were destroyed when their explosive charges detonated . Borgward originally developed the B IV as an ammunition carrier , but it was found unsuitable . It was also tested as a remote minesweeper , but was too vulnerable to mines and too expensive . During the Battle of France , German engineers from the 1st Panzer Division converted 10 Panzer I Ausf Bs into demolition and mine clearing vehicles , using them to place timed charges on bunkers or minefields without losing the vehicle . The " Waffenamt " found the idea valuable , and ordered the B IV ' s development as a remote - controlled demolition vehicle . The first vehicles were delivered in 1942 . The Borgward IV was much heavier than the Goliath , and carried a much larger payload . Both the Borgward IV and the Goliath were operated by radio , but due to the Borgward IV ' s much longer range a driver in the vehicle would bring it independently to its destination before dismounting and conducting it to its target by radio . When it reached the target , the vehicle would drop the charge and leave the danger area . This put Borgward IV operators in great danger . While the Borgward IV was armored , its armor was inadequate by 1942 - 43 , and its larger size than the Goliath made it much easier to spot . Variants . Three models of the Borgward were produced , " Ausführung " ( abbreviated to " Ausf . " ) A , Ausf . B and Ausf . C , primarily differing in armor , weight and radio equipment . The Borgward IV Ausf . A , the first model to enter serial production , was equipped with a 49 horsepower 4 - cylinder water - cooled gasoline engine . Ausf . A was the most produced model , with approximately 616 produced between May 1942 and June 1943 . In June 1943 , production shifted to the similar Borgward IV Ausf . B . The Ausf . B weighed more , the radio antenna was moved and better radio equipment was used . From June to November 1943 , 260 of this model were produced . The final Borgward IV to see production , the Ausf . C , saw greater changes . The chassis was lengthened to and the weight further increased . The armor on the Ausf . C was thicker than the previous variants , new tracks were used , the driver ' s seat was moved to the left of the vehicle and a new 78 horsepower six - cylinder engine was used . The Ausf . C was produced from December 1943 to September 1944 when production ended , with 305 examples built . Near the end of World War II , approximately 56 Ausf . Bs and Cs were converted to the " Panzerjäger Wanze " , armed with six RPzB 54 / 1 anti - tank rockets . In the last days of the war , these vehicles fought some minor skirmishes against Soviet armor and saw some action at the Battle of Berlin . At least one Ausf . B was rebuilt as an amphibious vehicle , and in 1943 one Borgward IV was equipped with a television camera for observation . Borgward IV production was relatively small : only 1 , 181 were produced , as compared to the 7 , 564 of the much smaller Goliath . Like Germany ' s other remote - controlled demolition vehicles , the Borgward IV was not considered a success ; it was unreliable and expensive , although unlike the Goliath and Springer it could be used multiple times . Survivors . Surviving examples of the Borgward IV are displayed in the Heeresgeschichtliches Museum in Vienna , the Kubinka Tank Museum the Military Vehicle Technology Foundation and the German Tank Museum in Munster . On 31 March 2010 , demolition work and excavation at Wien Südbahnhof uncovered a relatively well - preserved Borgward IV along with other relics from the Vienna Offensive . The Heeresgeschichtliches Museum salvaged and restored it for display there .