Transverse/horizontally opposed/longitudinal are the same.
Allow me to quote from a source of info which I wrote myself and
have posted in a number of different forums regarding chassis
designations.
SCANIA:
Note: MOST Scania chassis have rear mounted engines, there are very
few mid mounted underfloor examples)
The prefix applies to how the engine is mounted.
L = Vertically mounted engine, tilted 30 degrees to the left (not
sure how it is tilted as such)
K = Vertically mounted engine
N = vertically mounted engine, horizontally opposed (east-west
mounted)
F = front engined, vertically mounted.
I'm sure there are others, so please help.
These are the digits which signify the engine capacity (or engine
output), and follow immediately after the prefix.
9 = 9 litre engine (from 1st to 4th series)
11 = 11 litre engine (from 1st to 4th series)
12 = 12 litre engine (from 4th series)
230 = 230PS engine (from 5th series - 9 litre 5 cylinder
engine)
270 = 270PS engine (from 5th series - 9 litre 5 cylinder
engine)
310 = 310PS engine (from 5th series - 9 litre 5 cylinder
engine)
340 = 340PS engine (from 5th series - 12 litre 5 cylinder
engine)
380 = 380PS engine (from 5th series - 12 litre 5 cylinder
engine)
420 = 420PS engine (from 5th series - 12 litre 5 cylinder
engine)
The following digits, which follow the engine capacity indicate the
series
1 = 1st series
2 = 2nd series
3 = 3rd series
4 = 4th series
The suffixes inidicate the chassis type, and other extra
details.
CRB = standard/city floor height with stepped entry (1st to 3rd
series)
CRL = low floor chassis (1st to 3rd series)
ARB = standard floor height articulated chassis (1st to 3rd
series)
ARL = low floor articulated chassis (1st to 3rd series)
TRB = extended chassis (1st to 3rd series)
For the above, the second letter indicates where the driving
controls are situated.
R = Right hand drive
L = Left hand drive
UB = low floor chassis (4th and 5th series)
UA = low floor articulated (4th and 5th series)
IB = "intercity" height chassis with stepped entry (4th and 5th
series)
EB = touring chassis? (4th and 5th series)
The 5th series also include a further designation for the IB series
where you have:
Wheel Configuration (source: Scania website)
4x2 = 2 axle vehicle with drive on one axle
6x2 = tri-axle vehicle with drive on one rear axle. One tag axle
without drive infront of drive axle.
6x2/2 = tri-axle vehicle with drive on one rear axle. One tag axle
without drive in front of the drive axle. Used to designate
articulated buses.
6x2*4 = tri-axle vehicle with drive on one rear axle. One steered
tag axle without drive behind drive axle
Chassis height
These suffixes denotes what kind of floor height is "married" to
the chassis, which is denoted by the prefix. It only applies to the
5th series of Scania chassis. A further designation applies to the
5th series
E = Extra Low
L = Low (low front and normal rear)
M = Low (low front and middle, normal rear), articulated
N = Normal (normal front and rear)
Ok, now the examples.
K94IB = vertically mounted, 9 litre motor, 4th series chassis,
intercity floor chassis
N113ARB = horizontally opposed vertically mounted 11 litre motor,
articulated standard/city floor chassis
L113TRB = vertically mounted 11 litre motor tilted 30 degrees to
the left on an extended chassis
K380IB4x2NB = Vertical 380PS engine with a multipurpose chassis for
long and short distances and with normal drive and ride comfort
without the special adaptation. It is a 2 axle chassis with a
normal floor level throughout the chassis and full air
suspension.
K420EB6x2*4LI = Vertical 420PS engine with a chassis for long
distance travel and high drive and ride comfort. Chassis has no
special afaptation, and has 3 axles, with a steered tag axle behind
the drive axle. The coach may aslo be built with a low boarding
step and a low floor from the front up to the rear axle. This type
of coach is also built with a normal floor level throughout
(denoted by the "N", and the chassis is fully air-suspended with
independant front suspension.
N310UA6x2/2EB = Transverse engine with 310PS, articulated citybus
chassis. Has 3 axles, with a non-steered axle infront of the drive
axle. Low floor throughout the length of the bus (denoted by the
"E") and the chassis is fully air-suspended.
Further info can be seen on this link: http://www.busaustralia.com/forum/viewtopic.php?t=481
If you would like to challenge me on other technical info, please
feel free to do so, and I promise you that I will be able to back
my facts up with info from spec sheets, of which I have many in my
posession through my work.