Question: Where is the builder of The V/Line RTL class headquartered?

Context paragraphs:
Mathijs Bouman: Mathijs Nicolaas Bouman (born 1 May 1966) is a Dutch economist and journalist.  He is a regular contributor to the TV programs "RTL Z" and "De Wereld Draait Door" and writes columns for "Het Financieele Dagblad" and the business website Z24.nl.  A critic of the Dutch Polder model, in which "bad luck is officially forbidden" and "accidents are banned", he is referred to as a market liberalist, and as a prominent opinion builder whose Twitter account is recommended for "peppered" opinions.

Direct-coupled transistor logic: Direct-coupled transistor logic (DCTL) is similar to resistor–transistor logic (RTL) but the input transistor bases are connected directly to the collector outputs without any base resistors. Consequently, DCTL gates have fewer components, are more economical, and are simpler to fabricate onto integrated circuits than RTL gates.  Unfortunately, DCTL has much smaller signal levels, has more susceptibility to ground noise, and requires matched transistor characteristics.  The transistors are also heavily overdriven; that is a good feature in that it reduces the saturation voltage of the output transistors, but it also slows the circuit down due to a high stored charge in the base.  Gate fan-out is limited due to "current hogging": if the transistor base-emitter voltages ("V" ) are not well matched, then the base-emitter junction of one transistor may conduct most of the input drive current at such a low base-emitter voltage that other input transistors fail to turn on.

RTL 8: RTL 8 is the fourth channel of the RTL Group in the Netherlands and began transmission on 18 August 2007 when it replaced Tien, previously known as Talpa.  RTL 8's main target is the female audience.  It broadcasts Soap operas, talk shows, films and reruns of programmes from its sister RTL channels.  In the mornings and late afternoons children's channel RTL Telekids is broadcasting on RTL 8.  Officially RTL 8, along with all other Dutch RTL channels, is a Luxembourg television station with a Luxembourg television license.  Therefore, the channel is also headquartered in Luxembourg.  By doing this RTL can avoid more severe control by the Dutch media authorities, as Luxembourg does not have a strict authority that regulates its broadcasters.

Axiom of limitation of size: In set theory, the axiom of limitation of size was proposed by John von Neumann in his 1925 axiom system for sets and classes.  This axiom formalizes the limitation of size principle, which avoids the paradoxes by recognizing that some classes are too big to be sets.  Von Neumann realized that the paradoxes are caused by permitting these big classes to be members of a class.  A class that is the member of a class is a set; a class that is not a set is a proper class.  Every class is a subclass of "V", the class of all sets.  The axiom of limitation of size says that a class is a set if and only if it is smaller than "V" — that is, there is no function mapping it onto "V".  Usually, this axiom is stated in the equivalent form: A class is a proper class if and only if there is a function that maps it onto "V".

V/Line RTL class: The V/Line RTL class is a road-rail locomotive, capable of operating on both road and rail.  It was basically a truck with retractable rail wheels.  Built by Western Star Trucks in the United States, the rail equipment was provided by Brandt Industries of Canada.

Western Star Trucks: Western Star Trucks Sales, Inc., commonly designated Western Star, is an American truck manufacturer headquartered in Portland, Oregon, United States and a subsidiary of Daimler Trucks North America, in turn a wholly owned subsidiary of the German Daimler AG.

Resistor–transistor logic: Resistor–transistor logic (RTL) is a class of digital circuits built using resistors as the input network and bipolar junction transistors (BJTs) as switching devices.  RTL is the earliest class of transistorized digital logic circuit used; other classes include diode–transistor logic (DTL) and transistor–transistor logic (TTL).  RTL circuits were first constructed with discrete components, but in 1961 it became the first digital logic family to be produced as a monolithic integrated circuit.  RTL integrated circuits were used in the Apollo Guidance Computer, whose design was begun in 1961 and which first flew in 1966.

FastCode: FastCode is an open source programming project aimed at providing enhanced runtime library routines for Embarcadero Delphi and C++ Builder.  Since it was started in 2003 by Dennis Kjaer Christensen, it has contributed highly optimised functionality to the Delphi runtime library (RTL).  FastCode is unique among contributions to commercial compiler runtime libraries for its community-driven and open source nature.

Little People (TV series): Little People is an animated TV show based on the Fisher Price Little People toy line, produced by HIT Entertainment, and broadcast on Sprout.  International the show was pickup by Cartoonito and Tiny Pop (UK), Piwi+, Super RTL, Rai YoYo, MiniMini+, RTL Nederland, Discovery Kids (Latin America), E-TV (South Africa), TV Cultura (Brazil), Canal Panda (Portugal), Televisa (Mexico), and Family Jr. (Canada).  It premiered on Sprout on March 7, 2016, and remained on the network until February 23, 2017, when it was taken off the air.  All traces of the show were entirely removed from the Sprout website as well.

VOX (TV channel): VOX or Vox is a German television channel, headquartered in Cologne and part of the RTL Group, Europe's second largest TV, radio, and production company.  The channel officially launched at 5:00pm on January 25, 1993.  Prior to that, test transmissions had been made using the informal name "Westschienenkanal" ("West slot channel", a reference to "Nordschienenkanal" and "Südschienenkanal", the informal names used in the 1980s for the other two German private channels RTL and Sat.1).  The channel mainly broadcasts documentaries and US series and movies.

Supporting paragraphs: V/Line RTL class Western Star Trucks
Answer: Portland, Oregon