 Two years later , four units of vacuum fluorescent displays ( VFD ) were mounted on the ceiling . Eight units of dynamic route maps were mounted above every door in each car in trainset 053 / 054 for a two @-@ month trial . This new SMRT Active Route Map Information System ( <unk> ) was then progressively introduced to all C151 trainsets , and subsequently to <unk> and C751B trains for a cost of S $ 12 million — S $ 20 @,@ 000 per car . It became standard equipment on all new rolling stocks subsequently introduced on the East @-@ West Line and North @-@ South Line . 
