▁and ▁ 1 1 ▁January ▁ 1 9 9 1 , ▁also ▁involving ▁Silver ▁Fern ▁rail c ars . ▁ ▁P erman ent ▁Silver ▁Fern ▁replacement ▁ ▁Monday , ▁ 2 ▁December ▁ 1 9 9 1 ▁saw ▁the ▁Silver ▁Fern ▁rail c ars ▁replaced ▁on ▁the ▁day light ▁N IM T ▁run ▁by ▁the ▁Nor ther ner ▁stock , ▁Inter City ▁having ▁learned ▁from ▁the ▁benefits ▁a ▁carriage ▁train ▁provided ▁over ▁the ▁three ▁ 9 6 - se at ▁rail c ars . ▁To ▁facil itate ▁this , ▁a ▁third ▁mod ular ▁van ▁fitted ▁with ▁ 1 1   k W ▁generator ▁for ▁power - l ugg age ▁use ▁and ▁a ▁W air ar apa ▁Connection ▁car ▁turned ▁ 3 2 - se at ▁ser very ▁car ▁were ▁made ▁available ▁to ▁form ▁a ▁third ▁train set . ▁Also , ▁the ▁ser very / observ ation / re ar view ▁Bay ▁Express ▁car ▁and ▁the ▁observation / re ar view ▁T ran z Al pine ▁Con no isse urs ▁car ▁were ▁added ▁to ▁provide ▁extra ▁view ing ▁opportun ities . ▁The ▁day light ▁services ▁were ▁named ▁the ▁Over land er ▁Express es . ▁ ▁During ▁the ▁transition ▁period , ▁the ▁former ▁Vice - Reg al ▁carriage ▁turned ▁Sou ther ner ▁buff et ▁carriage ▁was ▁ref itted ▁in ▁ 1 9 9 3 ▁with ▁shorter ▁buff et ▁counter ▁and ▁ 2 4 ▁seats ▁of ▁the ▁type ▁designed ▁by ▁Add ington ▁Work sh ops , ▁arranged ▁alc ove - style ▁to ▁replace ▁the ▁long ▁counter