David,
There's a number of them on the DLS. I just did a search for concrete slab and found this plus more below which may be useful.
[TABLE="width: 1000"]
[TD="width: 1000, align: center"][TABLE="width: 1000"]
[TR]
[TD="align: left"][TABLE="width: 725"]
[TR]
[TD="align: left"]
Description
Put this under the big sheds[/TD]
[/TR]
[TR]
[TD="align: left"]Type: Buildings / Structures | Version: TRS2004 | KUID2: <KUID2:50587:11556:2> | Filesize: 98.89 kb | File Type: .cdp | Downloads: 2254[/TD]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
[/TD]
[TR]
[TD="colspan: 3, align: center"]
[/TD]
[/TR]
[/TABLE]
[TABLE="width: 1000"]
[TR]
[TD="width: 250, align: left"]
Download Page [/TD]
[TD="align: left"][TABLE="width: 725"]
[TR]
[TD="align: left"]
Concrete Slab Edge -
dricketts
9th January 2015
Description
Use this spline as a concrete slab underneath track with concrete abutment and concrete bridge support .
This is a reskin. Original model by Chris Whiting.[/TD]
[/TR]
[TR]
[TD="align: left"]Type: Road | Version: TS2009 | KUID2: <KUID2:135229:100500:1> | Filesize: 1.23 MB | File Type: .cdp | Downloads: 263[/TD]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
[TABLE="width: 1000"]
[TR]
[TD="width: 250, align: left"]
Download Page [/TD]
[TD="align: left"][TABLE="width: 725"]
[TR]
[TD="align: left"]
SAM P - Concrete slabs old TS -
samplaire
13th July 2014
Description
A stack of old used concrete slabs.[/TD]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]