I looked up 'squeal' on the Download Station and I came up with the following:
An object that had 'squeal' in it's description:
BNSF50 made 'Flange Curve Squeal' <kuid:39134:102473>. It's a 'Miscellaneous' type. Made for TRS2006 SP1 and up.
Natvander made 'NSW ML Concrete 5m SQ' <kuid:61119:1114>, which makes a 'squealing' sound since it's used for tighter curves. Please note that there are also other track that appears from Natvander, but they all have in the description: 'The 5m SQ track incorporates a wheel squeal sound effect for your tighter curves'. It's of course, a 'Track' type. Made for TRS2006 and up.
Natvaner also made 'Flange Squeal' <kuid:61119:1111>. It's not a 'Track' or 'Miscellaneous' type, but a 'HTML-Asset'. Made for TRS2006 and up.
Wiley4 made 'Steel_Flange' <kuid:45203:100825>. It's a 'Building - Structure' type. Made for Trainz Service Pack 3 and up.
An object that has 'squeal' in its name:
Dricketts made '#132 Jointed Slightly Used (Light Gray High Bllst) Squeal", <kuid2:135229:100287:2>. It's a 'Track' type, and is made for TS2009 and up. I believe he made some similar track.
BNSF50's 'Flange Curve Squeal' and Natvander's 'Flange Squeal' also appear, since they have 'squeal' in their name.