▁been ▁removed , ▁although ▁three ▁brid ges ▁are ▁still ▁ext ant : ▁a ▁pair ▁over ▁Route ▁ 1 2 8 ▁and ▁the ▁off - r amp ▁from ▁exit ▁ 2 3 , ▁and ▁one ▁over ▁the ▁Charles ▁River ▁that ▁still ▁car ries ▁a ▁single ▁track . ▁ ▁Service ▁One ▁of ▁the ▁more ▁interesting ▁aspects ▁of ▁this ▁short ▁branch ▁line ▁was ▁the ▁use ▁of ▁an ▁inter urban - style ▁electric ▁car ▁# 0 1 ▁( nick named ▁the ▁" P ing ▁P ong "), ▁which ▁would ▁provide ▁sh utt le ▁service ▁between ▁the ▁R ivers ide ▁Station ▁on ▁the ▁Boston ▁and ▁Alb any ▁main ▁line ▁and ▁a ▁single ▁station ▁at ▁Lower ▁F alls . ▁ ▁Early ▁in ▁the ▁ 2 0 th ▁century , ▁to ▁eliminate ▁the ▁cost ▁and ▁incon ven ience ▁of ▁running ▁a ▁steam - power ed ▁train , ▁the ▁Boston ▁and ▁Alb any ▁Rail road ▁hung ▁t rol ley ▁wire ▁over ▁the ▁track . ▁For ▁a ▁brief ▁period ▁before ▁passenger ▁service ▁ended , ▁a ▁single ▁coach ▁was ▁pulled ▁or ▁pushed ▁by ▁an ▁R S - 1 ▁locomot ive . ▁ ▁References ▁ ▁External ▁links ▁Image ▁of ▁the ▁former ▁crossing ▁at ▁Con cord ▁Street ▁Br id ges ▁over ▁Route ▁ 1 2 8 ▁and ▁off - r amp ▁on ▁B ing ▁Maps ▁▁ ▁Category : B oston ▁and ▁Alb any ▁Rail road ▁lines ▁Category : R ail ▁infrastr ucture ▁in ▁Massachusetts <0x0A> </s> ▁William ▁Brad field ▁Lane ▁( Nov ember ▁ 2 , ▁ 1 9 1 6 ▁– ▁June ▁ 2