Section 3: Plan Layout (Exhibit A)Anchor: #i1000930
Preliminary Plan Layout
The district prepares a full-size, preliminary plan layout sheet (including the plan-profile) showing critical details proposed for the grade separation. Additional sheets may be used, if necessary. Critical details should include:
- project geometry
- vertical & horizontal clearances
- crash walls
- position of track
- any existing features and other pertinent information.
- work to be done by TxDOT
- work to be done by TxDOT’s contractor
- work to be done by railroad
- general notes
- train data
- typical section
- fiber optics note
- appropriate drainage features.
The district submits the preliminary plan layout sheet to the Design Division (DES) for processing with the railroad company. It should be submitted 12 months prior to the scheduled contract letting date. The information provided on the preliminary plan layout eventually goes into Exhibit A of the agreement.Anchor: #LKEKKLGG
Complete Exhibit A
Following the approval of the preliminary bridge layout by the railroad, the district prepares the complete Exhibit A plan layout to show all worked performed by TxDOT, TxDOT’s contractor, and the railroad. The complete Exhibit A should include:
- project data
- a title block
- design layout sheets
- a work list
- clearances and crash walls
- other pertinent information.
Discussions of each of these items follow. Figure 8-1 at the end of this section shows an example of Exhibit A plan layout.Anchor: #i1001064
Project data include:
- the county and county number
- project number
- control-section-job (CSJ)
- railroad mile post (RRMP)
- highway station
- highway number or road name.
The title block includes:
- the railroad company name and DOT No. (if available)
- crossing location
- railroad milepost and highway station at each location
- the words “Exhibit A.”
Design Layout Sheets
Explanations of the elements shown in the design layout sheets follow.
Alignment of Highway and Railroad. The alignment of the highway and railroad and angle of their intersection should be shown.
Fences and ROW Lines. The location of railroad fences or right-of-way lines with respect to the centerline of the main track should be shown.
Poles and Lines. The location of each pole and pole line, the number of cross arms and wires, owner of each line, and elevation of the low wires should be shown. For underpasses, it is important to show the location of poles in and near the proposed underpass in the area where a temporary shoofly track might be located.
Top-of-rail Profile. The top-of-rail profile for approximately 500 feet in each direction from the highway and for a greater distance if a change in railroad grade is proposed should be shown. If the railroad is on a curve, the profile should be taken along the high rail for overpasses and along the low rail for underpasses.
Drainage Features. Drainage features should be shown.
Overpass Drawings. For overpasses, roadway grades, line drawings, and cross section of the structure should be shown. Minimum vertical clearance together with the horizontal clearances should be shown. (See the Bridge Design Manualfor standard clearances for railroad overpasses.)
Underpass Drawings. For underpasses, a cross section through the structure should be shown, along with a section at the underpass indicating vertical and horizontal clearances, types of curbs or medians (if required), and side slopes of roadway cuts. (See the Bridge Design Manualfor standard clearances for underpasses.)
Railroad Facilities Requiring Adjustment. The location and description of any railroad facility that might require adjustment, including any proposed revision of railroad grade, should be shown.
Boring Data. Boring data should be plotted on the plan-profile sheet.
Roadway Geometric Features. Typical roadway geometric features, including pavement widths, shoulder widths, and embankment slopes should be indicated. For underpasses, the method for handling surface drainage should be indicated.
Shoofly Track Location. The proposed location of any shoofly track for routing rail traffic during construction of an underpass should be shown. Include a typical section through the shoofly embankment with a clear designation of what work is the responsibility of the state and which is the responsibility of the railroad company.Anchor: #i1001210
The work list provides a breakdown of all work to be performed by TxDOT, TxDOT’s contractor, and the railroad company. The type of work to be performed on the railroad’s right-of-way should be listed. The work list should include a typical section. When coring is involved, it is important to show where the coring will be performed in connection to the railroad tracks.Anchor: #i1001220
Clearances and Crash Walls
All vertical clearances from the top of rail and horizontal clearances from the centerline of the tracks must be clearly shown. Crash walls should also be shown.Anchor: #i1001230
If grade crossings are to be constructed in conjunction with an overpass or underpass, all information required for the grade crossing work should be shown on the overpass layout. For proposed automatic warning devices, a separate exhibit illustrating the grade crossing should also be supplied.Anchor: #i1001240
Any other pertinent information, such as the cross section or plan profile of drainage structures or any pertinent information from the approval process.
Figure 8-1. Example Exhibit A plan layout for grade separation project.
(To access the MS Word version of both panels of this figure from on line, click this file name: TFEG8-1.)