Well, there is a new kid on the block.. SMAA Injector.. I will not link to it, because honestly I don't want to be remotely responsible or tech support for anything you do..

1. If you Google and use the SMAA injector and use the Steam ingame overlay you must edit injector.ini and switch a flag from 0 to 1 to be compatible. If you do not your game will be completely washed out in brightness.
2. If you use this and your game suddenly starts crashing or SBHH.. Do not email RSC.. It's not their problem you tinkered.. Delete SMAA files, verify your cache and leave it at that.
3. Do not use this with other games while playing on anti cheat enabled servers (may be detected as a cheating).
4. This option really should be only used if you're avidly disabling AA in the Railworks wrapper as it will provide AA with little to no overhead and better than the MLAA setting.
5. Bears repeating.. Use at your own risk.. RSC, Me, Bill Gates, or Adam Sandler are not responsible for anything outside of normal use you do with your Railworks installation. See #2..
About SMAA:
We present a new image-based, post-processing antialiasing technique, that offers practical solutions to all the common problems of existing filter-based antialiasing algorithms. It yields better pattern detection to handle sharp geometric features and diagonal shapes. Our edge detection scheme exploits local contrast features, along with accelerated and more precise distance searches, which allows to better recognize the patterns to antialias. Our method is capable of reconstructing subpixel features, comparable to 4x multisampling, and is fully customizable, so that every feature can be turned on or off, adjusting to particular needs. We propose four different presets, from the basic level to adding spatial multisampling and temporal supersampling. Even this full-fledged version achieves performances that are on-par with the fastest approaches available, while yielding superior quality.
Let's roll this beautiful bean footage.. I choose NEC to show the contestants. Railworks AA slider is set to OFF for all three of these.
Click all thumbnails for link to view fullsize.(action/view all sizes)
First a base: No AA injection at all and TS 2012 as is with no AA.

noaa by styckxx, on Flickr
Second: SMAA

smaa by styckxx, on Flickr
Third: The original.. FXAA

fxaa by styckxx, on Flickr
Now cropped key areas for good comparisons.
SMAA:

SMAA Crop by styckxx, on Flickr
FXAA:

FXAA Crop by styckxx, on Flickr
SMAA:

smaacrop2 by styckxx, on Flickr
FXAA:

fxxaacrop2 by styckxx, on Flickr
SMAA.. Winner?
