It's funny that they used the Allied term for it (Tokyo Express), instead of their own (Rat Transport), even in the original Japanese.
The former does sound much cooler though.
They already have the rat transport. Just need to add up new name for the drums.
Quest D11 Expedition 13 and 21
Nowaki-san...Ooyodo-san and Nowaki-san......wakiOnsen♥OITA!!Written with the 大 of Ooyodo and the 分 of Nowaki, just read differentlyWe've gotten some drums prepared over here, so if you could do a Tokyo Express run?Ooyodo-san...It's the Tokyo Express, though!?Let us depart!! To Oita!!The preperation is all done, Yuugumo-san. Shall we go?O...Yes!! I got it!!Yes...Industry, cuisine, even health and beauty - there is a wide range of utility to its bounty of rich hot springs.A prefecture that boasts Japan's largest volume of hot springs, and is famous for ones such as Beppu and Yufuin Onsen.