Body

The armoured body featured 8 to 20 mm (0.31 in to 0.79 in) thick welded sloped armour all around, making it effectively bullet proof. For disembarking and boarding, the troop compartment had an armored hatch on each lower side of the vehicle, right in front of the rear axle wheels.

The troop compartment originally lacked a fixed roof and had partially open sides meant for the infantry to shoot from as part of its infantry fighting vehicle role. Instead of a fixed roof, the back end of the body had full height sides so a tarpaulin could be fitted over the troop compartment between the cabin and the back.^[1] In 1983, most remaining vehicles were updated with a new fully enclosed troop compartment with firing ports and a back door for fast disembarkment.^[1]

Armament

While always intended for fixed armament, featuring a round hatch sized hole on the cabin roof, the vehicles initially lacked any permanent weapons, and the cabin roof hole was often bolted over with a metal plate.^[1] Instead the vehicles were outfitted with storage for the weaponry, munition and equipment of the pansarskytte, such as machine guns, hand grenades and man-portable anti-tank systems. An early vehicle trialed using a 20 mm akan m/40 autocannon. The first standard fixed armament was a single ksp m/39 machine gun, fitted in a rotating turret ring on top of the cabin, sometime in the late 1940s.^[4] This machine gun could fire the 8×63mm m/32 machine gun cartridge or the 6.5×55mm m/94 rifle cartridge, depending on the barrel fitted.

In 1956, the existing vehicles received new armament in the form of twin ksp m/36 lv dbl (luftvärn dubbel) anti-aircraft machine guns in a rotating ring-mount on the cabin roof.^[1] These could also fire the 8 mm m/32 and 6.5 mm m/94 rounds depending on the barrel. Post 1972, they could fire the 7.62×51mm NATO cartridge. During the 1983 REMO-upgrade, the ksp m/36 twin-mount was replaced with two 7.62 mm ksp m/58B light machine guns in single mounts, one on the cabin roof and one at the back of the new troop compartment roof.^[1] The new enclosed compartment featured three portholes on each side of the vehicle for use as firing ports with assault rifles.

• 
  A Tgb m/42 KP in an early 1940s configuration, with the cabin roof hole bolted over.
• 
  Tgb m/42 KP in later 1940s configuation, armed with a single ksp m/39 machine gun on the roof, 1948.
• 
  Tgb m/42 KP in 1956 KPF configuation, armed with twin ksp m/36 lv dbl machine guns.
• 
  Tgb m/42 D SKPF (1983 REMO configuation), armed with two single ksp m/58B machine guns on the roof.

Development

In 1941, when tanks were organised into a unit of their own, it was clear there was a desperate need for a troop carrier able to both keep up with the tanks and provide protection against artillery shrapnel and small-arms fire. Due to the war, there were no international suppliers to buy from, so the only option was to develop a domestic solution. AB Landsverk designed an IFV consisting of a chassis from a regular army lorry equipped with an armoured coachwork. The prototype had many similarities to the German Sd.Kfz. 251 IFV, featuring a similarly shaped cabin front and a troop door at the back. The cabin front was altered and the back door removed on the service models.

After prototyping, production was set up based on two types of truck chassis, a Volvo chassis and a Scania-Vabis chassis. The armour-plates were made by Bofors, Landsverk, Bröderna Hedlund and Karlstads Mekaniska Werkstad and then delivered to Volvo or Scania-Vabis for final assembly on their chassis'. The Volvo versions, Tgb m/42 VKP had a fixed winch on the right side for towing the vehicle forward. The Scania-Vabis, SKP, had a windlass on the left side, which allowed towing both forwards and backwards.

The first approved delivery was made in 1944, after some 38 vehicles had been failed due to tensions caused by welding the hardened steel. This was rectified by switching to a soft-hardened steel and then heating the completed body-work in purpose-built ovens to remove the tensions.

During the 1950s the vehicles were modified with a ring-mounting for a double machine gun on the cab roof and at that time the designations changed to Tgb m/42 VKPF and SKPF (F = Fordonsluftvärn, or vehicular anti-aircraft).

In 1983, many surviving SKPFs of the Swedish Army were modified with armoured roofs and in many other ways, resulting in several new versions.

International use

The SKPF saw combat with Swedish UN forces during the Congo Crisis in the 1961–1964 period, while the VKPF was kept for domestic use. 15 SKPFs were also bought by the UN and used by the Indian and Irish battalions in Congo. After a number of KP gunners in Congo were shot in the waist, armour plating to cover the gap between the roof and the machine gun ring was added in sito.

A few left-behind UN SKPFs were reconditioned and used by the Congolese Army in 1964–65.

SKPFs were deployed by United Nations Peacekeeping Force in Cyprus during the intercommunal violence in 1964, some being donated to the UN forces there.^[5]

After the collapse of the Soviet Union, Estonia, Latvia and Lithuania received 10 SKPF each, for a total of 30, some being modified to mount a 12.7 mm DShKM heavy machine gun over the cabin.^[3]

REMO – 1983

REMO = Renovation, Modifikation: 223 total (Scania KP only).

• Terrängbil m/42 D SKPF (tgb m/42 D SKPF) – closed roof with firing ports and back door, armed with two single-mount 7,62 mm ksp 58B light machine guns on the front and back end of the roof, six smoke grenade dischargers, spaced external front armour removed due to weight, new terrain wheels (wheelhouse reworked), servo brakes and new street legal lighting, 173 modified.
• Stabterrängbil m/42 A SKP (stabtgb m/42 A SKP) – Equal to the terrängbil m/42 D SKPF but intended as a command vehicle with internally integrated radios: three Ra 421, one Ra 195, + electronics, 16 modified.
• Sjukterrängbil 9521 A (sjtgb 9521 A) – military ambulance version of the terrängbil m/42 D SKPF, unarmed, 23 modified.
• Terrängbil m/42 E SKPF (tgb m/42 E SKPF) – coup defense version of the terrängbil m/42 D SKPF, one ksp 58B light machine gun in original m/36 twin-mount, 11 modified.