The RVRR was built in stages, from south to north, as funding became available. By February, 1888, Melick had obtained sufficient money, $60,000 from sales of stock, to begin building the southernmost from White House to New Germantown (
Oldwick, New Jersey). This was based on Melick's original $15,000 per mile estimate. Much of this funding came from local peach growers who stood to gain from a rail connection to transport their perishable crop to market. The initial grading began on May 17, 1888. All work was performed using
picks,
shovels and wheel barrows. A
steam locomotive, an old
4-4-0, was christened as the
P.W. Melick (John E.V. Melick's father), and was put to work constructing the line, hauling
railroad ties and
railroad track. Although the line to Watnong would not be fully completed until August 1892, revenue started flowing into the railroad's coffers in 1888, as gross income for that year amounted to a modest $992.46. In 1889, the railroad pushed northward another to
Pottersville, New Jersey. This section, built as the Rockaway Valley Extension Railroad, required that $70,000 in stock be sold. Black River Falls, an early
tourist attraction, was located a short distance from the
depot in Pottersville. Fortunately for the railroad, the first 8 miles to Pottersville was almost entirely flat and posed no significant engineering challenges. The next extension, from Pottersville north to
Peapack, New Jersey, however, would be different. This section would feature an L-shaped climb up a 2%-3.5% grade, with a 4% drop on the other side of the hill, and a , wooden trestle, the only significant structure on the mainline of the railroad. Starting late in 1889, and then after the Spring thaw in 1890, work on the Rockaway Valley Peapack Extension Railroad was performed. The railroad would bypass the Lackawanna's
Peapack station by nearly a half a mile (roughly 1 km). It's not entirely clear why Melick chose to avoid Peapack, but more than likely cost was the reason, as this section was funded for only $70,000, and any significant deviation in route in an easterly direction towards Peapack would have required much more funding from
stockholders. It was at this point in time that talks between RVRR backers and the Lackawanna Railroad took place in the hope of luring the Lackawanna's deep pockets into building a line from Morristown to a connection with the RVRR at Mendham. Unbeknownst to the RVRR's backers, however, the Lackawanna had already surveyed numerous routes to Mendham and had rejected all of them. The Lackawanna's management—or more exactly, the
Morris and Essex Railroad's management—would pay
lip service to building the line, but would never seriously pursue the project. . As such, construction on the extension from Peapack to
Mendham, New Jersey started on August 26, 1890, under the Rockaway Valley Mendham Extension Railroad Company, although the company wouldn't be legally incorporated for another 3 weeks. The first train to Mendham ran on June 25, 1891. Engineering-wise the section to Mendham, which also passed through the town of Ralston, New Jersey, was relatively unremarkable by RVRR standards, although the 1.8% grade northward to Mendham would have been significant for many other railroads. The RVRR located its Watnong depot on the northern bank of the Whippany River on the east side of Lake Valley Road. On a rail profile map the "final" 7 miles from Mendham to Watnong (2 miles from Morristown) appears as a gently downhill ride into the county seat of
Morris County, New Jersey. Built as the Rockaway Valley Morristown Extension Railroad, the first train arrived in Watnong in early August 1892. Of all the sections of RVRR
right-of-way, this would prove to be the most problematic, as the last several miles into Watnong traversed a
swamp. For most railroads this would have required that extra fill material and ballast be placed in order to build up the right-of-way well above the surrounding
water table. But the RVRR constructed the section through
Washington Valley (near Milepost 22), very much like every other section on the railroad. The result: this section, particularly during wet periods, would almost literally sink into the muck. ==Consequences of poor construction==