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May 1996 - Page 17

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13 This is a high-speed, spring-rail type of frog. Note that one of the wing rails is forced against the frog rai l by several spri ng-loaded pistons. This red uces the potentia l for derailments through the frog.

14 A typical self-guarding frog uses no guard rails along side the stock rails. Instead, the wing rails extend above the railhead and act as guard rai ls.

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T his prototypically scal ed N scale turnout is located on the author's East Portal Moffat Tun nel module.

Figure I shows a rigi d frog type. This has been common on most railroa ds, especially on low-spee d tracks. These were originally made from separate rail segments. Now, most are cast as a single component. This frog requires two guard rails alongsi de the stock rails to keep the wheels from picking a route not describe d by the points. Other frog types are self-guarding (uses no separate guard rails), spring rail (mov ing wing rails) an d moveable (hinge d frog rails). For most mo deling, avoi d these three types as they are difficult to achieve with reliability. Note also the bri dle bar or the connection between the points. This bar or angle iron is connecte d only to the points an d not the stock rails. Also, the wing rails an d guar d rails have a slight ben d at the en ds to help ease the wheel flanges into the directing rails. The point heel i s the location where the points are hinge d t o t h e closure rails. In the pro totype, various anchors an d lUbber blocks ar'e use d to keep the align ment of all the various rail parts i n a turnout. Grease is usually abun d ant aroun d the toe an d heel of the points. Grease marks ar'e an often-neglecte d detail on most layouts. For realism, the tops of the
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g uard rails an d wing rails shoul d be left lUsty. Practically, they usually get cleane d along with the rest of the track on our mo d railroa ds. el For some mo delers, a template ai ds with tie placement un der a turnout. For small turnouts, like #4s or #5s, the variation in tie loca tions is not critical. But for the big turnouts, templates are critical. Figure 2 supplies templates for three sizes of big right-han d turnouts, # 1 0, # 1 2 an d a # 1 4. These templates have been develope d using the American Railway Engineering Association (AREA) stan dar ds for turnouts. The templates are full-size for N scale an d can easily be copie d. Copy the page onto a transparency, flip the transpar'ency over an d copy again. This will provi de you with left-han d turnouts. They have been develope d using Micro Engineering ties an d their co d 40 e rail. Part I I I next month w i l l use these templates extensively. Along with the tie templates is Figure 3 which illustrates the loca tions for electrically gapping the turnout. Again, Part I I I will explain this diagram. Figure 4 w i l l also be u seful when constlUcting the turnout next month. It shows several critical dimensions an d position ing of the various rail pieces. The photos this month (Photos 10- 14) describe typical turnouts commonly foun d on the prototype. Although locate d on the B urlington Northern an d Union Pacific, they are typi cal of mo dern turnouts dup licate d by the thousan ds a l l over North American railroa ds of to day.

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