The MRT Purple Line Project, Bang Yai – Bang Sue Section is a 23-kilometer elevated heavy rail transit system with 16 elevated stations situated along the route, a depot with operation control centre and 4 park and ride facilities.
The alignment of the Project starts at Khlong Bang Phai, where the depot is located, continues on Kanchana Phisek Road to Bang Yai T-junction, turns left onto Rattana Tibet Road, then crossing over the Chao Phraya River in parallel southwardly with the Phra Nang Klao Bridge, passing the Nonthaburi Civic Centre, then turns right onto Tiwanon Road, and then turns left onto Krung Thep-Nonthaburi Road, crossing over Wongsawang intersection flyover, and terminates at Tao Poon T-junction.
The connection between Tao Poon terminal station and Bang Sue Station of the existing Chaloem Ratchamongkol Line (Blue Line), along Pracharat Sai 2 Road, is also part of the Project.
The construction of the MRT Purple Line Project, Bang Yai – Bang Sue is divided into two elevated sections. The elevated section west (Contract 2) extends from the terminal station at Khlong Bang Phai Station to Phra Nang Klao Bridge Station up to the interface with the elevated east section at Pier No. P298 (the pier is the scope of Contract 2).
The second section, the elevated structures east (Contract 1) extends from the interface with the Contract 2 on P298 to Yaek Nonthaburi 1 Station on to Tao Poon Station before finally connecting to the MRT Chaloem Ratchamongkhon Line at Bang Sue station via a transition structure and cut & cover tunnel.
A depot, workshop, train operation control centre, train stabling will be located at the beginning of the line and occupy an area approximately 145,000 sq.m. and constructed about 10m above the road level. Four Park & Ride Building will also be constructed along the route.