Ginormous frogs?

[Beachbum]

Noticed some very high switch frogs in the METRA yard south of Chicago US the other day. These things stick up about 3-4 inches higher than the railheads - almost look like Code 100 frogs on Code 83 switches.

Anybody know the story on these things? I vaguely remember something about titanium (?) frogs coming into use, but I don't recall the details.

 

[hamltnblue]

A pic might help
Any chance they were derailers?

 

[SP4439]

Sounds like self guarded frogs to me.

 

[Beachbum]

A pic might help
Any chance they were derailers?

Definitely not derails. I didn't have a camera with me and I no longer ride METRA daily. Maybe I can find one on the Web somewhere (and that will probably answer my question to boot. )

Addendum: Look like self-guarded frogs and the application fits, although they did seem taller to me than in this pic:

http://www.harmersteel.com/catalog/frogs-switches-turnouts/solid-manganese-self-guarded-frogs/