WLBA2 has similarities to B7 passenger carriages, which were recently manufactured by Strømmen.
The WLAB is tailor-made as a sleeper.
The bodies are 27.00 meters (88.58 ft) long.
They are dimensioned to maximally exploit the Norwegian loading gauge – measuring 3.24 meters (10.6 ft) wide and 4.22 meters (13.8 ft) tall, their roofs have an octagonal profile.
Despite the aluminium body, each car weighs 48 tonnes (47 long tons; 53 short tons).
This is caused by the weight of the insulation between compartments.

Similar to the contemporary B7, Class 69D and Class 92, WLAB2 received Wegmann-designed bogies in a B-B configuration licence-built by Strømmen.
They are modified with softer primary suspension to give a smoother ride.
The bogies are rated for a maximum speed of 150 kilometers per hour (93 mph).
Each axle features wheels with a new diameter of 610 millimeters (24 in) and two disk brakes.
They are powered through a 5-bar (500 kPa) pneumatic cable running through the train.
It is supplemented with an auxiliary 6-bar (600 kPa) cable for appliances.

The carriages feature fifteen compartments and a corridor on the one side.
There are regular doors at the one end of the carriage, where there is a vestibule, while smaller doors on the other end act as emergency exits.
To provide comparability with older WLAB and B5 carriages, WLAB2s were initially installed without a closed gangway connection.
On the compartment side there is one window for each compartment.
On the corridor side there are two rows of windows and fifteen folding seats, each with place for two people.

The closest compartment to the doors is slightly larger than the others, allowing for enough space for a wheelchair to access it.
However, the toilet is not sufficiently large for a wheelchair.
Each compartment has a twin-bunk bed.
The upper bunk can be collapsed into the wall, allowing the room to be converted to a single.
In this configuration the lower bunk can also be used as a sofa, with the walls being upholstered.
Initially children could sleep on a balcony room.
On the reverse wall of the beds are three niches, two which can be used as a wardrobe and one which features a folding ladder to the upper bunk.
There is a folding ladder and a sink in each compartment.

At each end of the carriage is a toilet operated with a vacuum sewer system, identical to those install on B7 and Class 92 trains.
a carriage features a 600-liter (130 imp gal; 160 U.S. gal) water tank and a 1,000-liter (220 imp gal; 260 U.S. gal) sewer tank.
These, along with the pressure vessel and other accessible equipment, is located on the underside of the carriage.
There is an air intake at the end of each carriage, which feeds a duct connecting to each compartment.
At the exits there are supplementary heating which allow for individual regulation of the room temperature between 12 and 22 °C (54 and 72 °F).
During periods with low outdoor temperature part of the air flow can be recycled.
The heating system is regulated electronically.
It is not equipped with air conditioning.
WLBA2 has similarities to B7 passenger carriages, which were recently manufactured by Strømmen. The WLAB is tailor-made as a sleeper. The bodies are 27.00 meters (88.58 ft) long. They are dimensioned to maximally exploit the Norwegian loading gauge – measuring 3.24 meters (10.6 ft) wide and 4.22 meters (13.8 ft) tall, their roofs have an octagonal profile. Despite the aluminium body, each car weighs 48 tonnes (47 long tons; 53 short tons). This is caused by the weight of the insulation between compartments.
Similar to the contemporary B7, Class 69D and Class 92, WLAB2 received Wegmann-designed bogies in a B-B configuration licence-built by Strømmen. They are modified with softer primary suspension to give a smoother ride. The bogies are rated for a maximum speed of 150 kilometers per hour (93 mph). Each axle features wheels with a new diameter of 610 millimeters (24 in) and two disk brakes. They are powered through a 5-bar (500 kPa) pneumatic cable running through the train. It is supplemented with an auxiliary 6-bar (600 kPa) cable for appliances.
The carriages feature fifteen compartments and a corridor on the one side. There are regular doors at the one end of the carriage, where there is a vestibule, while smaller doors on the other end act as emergency exits. To provide comparability with older WLAB and B5 carriages, WLAB2s were initially installed without a closed gangway connection. On the compartment side there is one window for each compartment. On the corridor side there are two rows of windows and fifteen folding seats, each with place for two people.
The closest compartment to the doors is slightly larger than the others, allowing for enough space for a wheelchair to access it. However, the toilet is not sufficiently large for a wheelchair. Each compartment has a twin-bunk bed. The upper bunk can be collapsed into the wall, allowing the room to be converted to a single. In this configuration the lower bunk can also be used as a sofa, with the walls being upholstered. Initially children could sleep on a balcony room. On the reverse wall of the beds are three niches, two which can be used as a wardrobe and one which features a folding ladder to the upper bunk. There is a folding ladder and a sink in each compartment.
At each end of the carriage is a toilet operated with a vacuum sewer system, identical to those install on B7 and Class 92 trains. a carriage features a 600-liter (130 imp gal; 160 U.S. gal) water tank and a 1,000-liter (220 imp gal; 260 U.S. gal) sewer tank. These, along with the pressure vessel and other accessible equipment, is located on the underside of the carriage. There is an air intake at the end of each carriage, which feeds a duct connecting to each compartment. At the exits there are supplementary heating which allow for individual regulation of the room temperature between 12 and 22 °C (54 and 72 °F). During periods with low outdoor temperature part of the air flow can be recycled. The heating system is regulated electronically. It is not equipped with air conditioning.
NSB WLAB-2