As a start, you could convert the elevated track
http://simutrans.s28.xrea.com/index.php?plugin=attach&openfile=kokarail128_set.zip&refer=Addon128%2FOthers, like I did. The dat file is here
Obj=bridge
name=koka_Bridge_single
waytype=track
cost=250000
maintenance=2500
topspeed=450
max_weight=120
max_lenght=0
cursor=./koka_Bridge_single.2.4
icon=> ./koka_Bridge_single.2.5
pillar_distance=1
BackImage[NS]=./koka_Bridge_single.0.0
FrontImage[NS]=./koka_Bridge_single.1.0
BackImage[EW]=./koka_Bridge_single.0.1
FrontImage[EW]=./koka_Bridge_single.1.1
BackRamp[N]=./koka_Bridge_single.0.2
FrontRamp[N]=./koka_Bridge_single.1.2
BackRamp[S]=./koka_Bridge_single.0.3
FrontRamp[S]=./koka_Bridge_single.1.3
BackRamp[E]=./koka_Bridge_single.0.4
FrontRamp[E]=./koka_Bridge_single.1.4
BackRamp[W]=./koka_Bridge_single.0.5
FrontRamp[W]=./koka_Bridge_single.1.5
BackStart[N]=./koka_Bridge_single.2.0
FrontStart[N]=./koka_Bridge_single.3.0
BackStart[S]=./koka_Bridge_single.2.1
FrontStart[S]=./koka_Bridge_single.3.1
BackStart[E]=./koka_Bridge_single.2.2
FrontStart[E]=./koka_Bridge_single.3.2
BackStart[W]=./koka_Bridge_single.2.3
FrontStart[W]=./koka_Bridge_single.3.3
backPillar[S]=./koka_Bridge_single.4.0
backPillar[W]=./koka_Bridge_single.4.1
