▁was ▁in ▁part ▁intended ▁to ▁address ▁comments ▁that ▁the ▁W 2 1 ▁as ▁originally ▁launched ▁was ▁a ▁little ▁small ▁to ▁be ▁considered ▁a ▁full - size ▁tax i . ▁Nevertheless , ▁the ▁standard - w heel base ▁model ▁achieved ▁output ▁of ▁ 9 , 2 8 1 ▁cars ▁during ▁a ▁production ▁run ▁of ▁slightly ▁more ▁than ▁three ▁years , ▁while ▁the ▁long - w heel base ▁model ▁achieved ▁ 6 , 3 4 1 ▁cars ▁during ▁a ▁shorter ▁production ▁run ▁of ▁slightly ▁above ▁two ▁years . ▁ ▁A ▁notable ▁success ▁was ▁the ▁popular ity ▁of ▁the ▁longer - b od ied ▁six - se ater ▁" P ull man - L im ous ine " – b od ied ▁version ▁for ▁use ▁as ▁a ▁" K raft dro sch ke " ▁( T axi ). ▁It ▁was ▁pres umably ▁simple ▁fl atter y ▁when , ▁in ▁August ▁ 1 9 3 4 , ▁Op el ▁announced ▁a ▁long - w heel base - P ull man - b od ied ▁version ▁of ▁their ▁Op el ▁ 6 . ▁The ▁cars ▁were ▁concept ually ▁similar ▁and ▁even ▁shared ▁an ▁identical ▁ ▁wheel base , ▁although ▁the ▁Op el ▁was ▁l ighter , ▁a ▁little ▁less ▁powerful ▁and ▁in ▁terms ▁of ▁performance ▁claims ▁slightly ▁faster . ▁The ▁biggest ▁difference ▁for ▁the ▁bu yer ▁was ▁probably ▁the ▁one ▁that ▁sur fac ed ▁when ▁pay ing ▁for ▁the ▁car . ▁ ▁Even ▁the ▁least ▁expensive ▁of ▁the ▁longer - w heel base ▁Mer cedes - B enz