This doesn't seem like it'd work...

[Ed Kapuscinski]

http://www.railpictures.net/viewphoto.php?id=316096

I'm surprised by that bridge's strength. Very surprised.

[Philip H]

All depends on the span width.  Short spans with good support on both ends may not need to be thick becaue teh weight goes back to ground quickly.

[cv_acr]

That looks like someone's model railroad scene. Vertical retaining walls alongside the track, with another line crossing on the upper level.

[DKS]

Very likely the deck is solid I- or H-beams from side to side, rather than girders.

I do think it qualifies as looking like a (bad) model.

Other views:

http://www.railpictures.net/viewphoto.php?id=276618&nseq=8

http://www.railpictures.net/viewphoto.php?id=239717&nseq=14

http://www.bing.com/maps/?v=2&cp=r00phn9163vn&scene=32675703&lvl=2&sty=b&where1=Woonsocket,%20RI

[conrail98]

Here's a street view of it

http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=railroad+st.+woonsocket,+ri&sll=39.992098,-74.963193&sspn=0.010587,0.018904&ie=UTF8&hq=&hnear=Railroad+St,+Woonsocket,+Providence,+Rhode+Island+02895&ll=42.004607,-71.518094&spn=0.001284,0.002363&t=h&z=19&layer=c&cbll=42.00463,-71.518219&panoid=W6mStxwPKwhGBtLacK2wdg&cbp=12,202.04,,0,18.67