Question: Acela Express is the flagship service of what major transportation hub in Newark, new Jersey?

Context articles: Acela Express
Bắc Giang
JetTrain
Hoboken, New Jersey
Penn Plaza East
Pennsylvania Station (Newark)
Exchange Place (Jersey City)
North Station
Hoboken Terminal
Wayne Route 23 Transit Center

The Acela Express ( ; colloquially abbreviated to Acela) is Amtrak's flagship service along the Northeast Corridor (NEC) in the Northeast United States between Washington, D.C. and Boston via 14 intermediate stops including Baltimore, Philadelphia, and New York City.
 The route contains segments of high-speed rail, and Acela Express trains are the fastest trainsets in the Americas; they attain 150 mph on 28 mile of the route.
Bắc Giang (  ) is a city in Vietnam.
 It is the capital of Bắc Giang Province.
 Its name, deriving from that of the Province Sino-Vietnamese, means "north of the river."
 The location is very convenient for transportation, it is 50 km north of Hanoi, in the middle position on major transportation routes (roads, international railway) connecting Hanoi with the Lang Son City and Dong Dang international border gate; Bac Giang locates in an important transportation hub.
 The Thương River runs through the town's southern part heading for Haiphong.
The JetTrain was an experimental high-speed passenger train created by Bombardier Transportation in an attempt to make European-style high-speed service more financially appealing to passenger railways in North America.
 It was expected to use the same LRC-derived tilting carriages as the Acela Express trains that Bombardier built for Amtrak in the 1990s and a similar locomotive.
 Unlike the Acela, powered electrically by overhead lines (as are most other high-speed trains), the JetTrain was designed to use petroleum-based fuel to power a diesel engine and multiple turboshaft engines for higher speeds.
Hoboken ( ; Unami: "Hupokàn") is a city in Hudson County, New Jersey, United States.
 As of the 2010 United States Census, the city's population was 50,005, having grown by 11,428 (+29.6%) from 38,577 counted in the 2000 Census, which had in turn increased by 5,180 (+15.5%) from the 33,397 in the 1990 Census.
 Hoboken is part of the New York metropolitan area and is the site of Hoboken Terminal, a major transportation hub for the region.
The Penn Plaza East complex takes its name for its location near Penn Station in Newark, New Jersey.
 Fronting Raymond Boulevard on the banks of the Passaic River, the two office buildings were constructed during a period in the late 1980s and early 1990s when they and numerous postmodern skyscrapers were built near the station and Gateway Center.
 While others went up between the station and traditional Downtown Newark, Penn Plaza East is on the Ironbound, or east, side of the major transportation hub.
 As of 2010, the buildings were occupied by the Newark headquarters of New Jersey Transit, JOC Group, and Horizon Blue Cross Blue Shield of New Jersey, which owns their building.
Pennsylvania Station (also known as Newark Penn Station) is a major transportation hub in Newark, New Jersey.
 Located at Raymond Plaza, between Market Street and Raymond Boulevard, Newark Penn Station is served by multiple rail and bus carriers.
 The rail carriers include Newark Light Rail, New Jersey Transit (3 commuter rail lines), the PATH rapid transit system to Manhattan, and Amtrak (11 lines including the Acela Express).
 National bus carries include Greyhound, Peter Pan and Trailways.
 Local and regional bus carriers include NJ Transit and ONE (Orange-Newark-Elizabeth), with 31 and 2 routes respectively.
Exchange Place is a district of Downtown Jersey City, New Jersey, United States, that is sometimes referred to as "Wall Street West" due to the concentration of financial companies that have offices there.
 The namesake is a square, about 200 feet long, at the foot of Montgomery Street at the Hudson River.
 This square was created by the landfilling of the shore at Paulus Hook, and has been a major transportation hub since the colonial era.
North Station is a major transportation hub located at Causeway and Nashua Streets in Boston, Massachusetts, United States.
 It is one of the city's two inbound terminals for Amtrak and MBTA Commuter Rail trains, the other being South Station.
 The main concourse of North Station is located at the street level immediately below TD Garden, a major sports arena.
 The arena is also used for concerts and other events, taking advantage of the extensive transportation connections at the site.
Hoboken Terminal is one of the New York metropolitan area's major transportation hubs.
 The commuter-oriented intermodal facility is in Hoboken, Hudson County, New Jersey, United States.
 It is served by nine NJ Transit (NJT) commuter rail lines, one Metro-North Railroad line, various NJT buses and private bus lines, the Hudson–Bergen Light Rail, the Port Authority Trans Hudson (PATH) rapid transit system, and NY Waterway-operated ferries.
 More than 50,000 people use the terminal daily, making it New Jersey's second-busiest railroad station and its third-busiest transportation facility, after Newark Liberty International Airport and Newark's Penn station.
 Hoboken Terminal is wheelchair accessible, with high-level platforms for light rail and PATH services and portable lifts for commuter rail services.
The Wayne Route 23 Transit Center is a mass transportation hub located in Wayne, New Jersey, USA.
 Operated by NJ Transit, the complex consists of two major components.
 One is a bus terminal that provides service to Port Authority Bus Terminal, Newark Penn Station, and intermediate points in the surrounding area.
 The other is a train platform that is connected to the Montclair-Boonton Line and offers service to Hoboken Terminal, connecting service to New York Penn Station, and local service to points between Montclair State University and Hackettstown.
 It is located off of the southbound lanes of New Jersey Route 23 on West Belt Road, near the interchange where Route 23, I-80, and US 46 meet, across from the Willowbrook Mall.
 The station opened in January 2008 and has 1,000 parking spaces.
 New Jersey Transit intends for this combined rail and bus station to become an "interceptor station," that will help relieve the habitual congestion at the West Belt Road Interchange, where the three major highways meet.
 In addition, the construction of the station was meant to also ease the congestion at what was then Route 23 Park & Ride, a bus depot on Route 23 North that has since been renamed Mother's Park & Ride, and the Willowbrook Mall Park & Ride; the now-Mother's site had limited parking while NJT was having trouble with overfull parking areas at Willowbrook.