This trail is so good I almost can't believe it exists. It has a little bit of everything scenery-wise: Winding, curvy stretches through the woods, long straight sections through open fields, mild ups and downs through wetlands with river views, a great climbing cliff, a neat tunnel... etc. Plus the entire thing is paved and there are several parking areas, making it accessible to people of all abilities. I've ridden it many times and it's always enjoyable. One minor thing to note is that while it is very peaceful during the week, it can get quite crowded on weekends, especially the areas closest to Columbia. Still, it is one of my go-to rail trails.

I road this trail today. The first item of note is the road is closed about 1 mile on the North Extension, that is a mile North of Route 30. You can ride from John Rudy County park to the closure. There may be a work around at the railroad bridge to the route 30 Parking lot. I started at the route 30 parking lot and went South to New Freedom. I would not recommend riding in this direction. The last section from about MP 5 up to New Freedom is uphill about a 6% grade. It is best to ride starting in New Freedom and biking to York. Also, The bike trail through York going South is a bit confusing through the town. At one point the RR track area was closed; however, the detour South was not clear. Okay

There is a newly opened nicely done parking lot at the Chesapeake City trail head one block up from Schaefers Restaurant.
Nice fully blackedtoped trail, two hills, but the rest very flat.

Great trail for my morning sweatsuit speedwalk.

I'm normally a bike trail reviewer, but pleased to see my local trail haunt listed here. The description is pretty accurate, more of a walking/jogging trail than a bike trail, but definitely a peaceful retreat in the suburbs. Pros: plentiful parking, easy gradient, abundant wildlife. Cons: not a very long trail (4 miles is a stretch even if you connect the looped paths), prone to erosion, puddles, and fallen trees/limbs (although cleanup is prompt). It's mostly wooded views with some traffic noise in areas, but no majestic vistas here. There are regular dog walkers like me, bird watchers, and families. I often see foxes, and the resident deer herd coexists well with humans. My canine companion and I come at least 3x a week, and walk approx 3 miles each time, so I figure we covered over 5k miles in the past 12 years (astonishing at how it adds up).

The National Central Railroad Trail (aka Torrey C. Brown Tail) runs north-south and connects Hunt Valley, Maryland with York, Pennsylvania. It is approximately 45 miles in length and the terrain is completely flat. Once in Pennsylvania, the trail becomes the Heritage Rail Trail County Park. The NCR runs next to the Big Gunpowder Falls River and there are a fair number of rest stops with bathroom facilities, as well as benches and picnic tables, along the way.
There are numerous places to enjoy the river’s beautiful views and the sounds of rushing water. If you are hungry and want to stop, there are cafés in Monkton, MD, New Freedom and Glen Rock, Pa. Trail highlights include the Howard Tunnel, the NCR Train (a real old-timey train that follows the same route that carried President Lincoln to Gettysburg where he delivered his address) and smaller two-person rail cars on the tracks. Additionally, there are bridges, beautiful corn and wheat fields and mile after mile of actual active railroad tracks. And, at the 11-mile mark north from Hunt Valley, there is Gnome Hill, a 10-foot high hill with hundreds of garden gnomes to check out. There is also a water and snack station at Gnome Hill. (Just watch out for deer crossing there.)
The trail is very well shaded and consists of a mix of crushed limestone and hard dirt. Even on 90-degree days, the temperature on the trial is extremely tolerable. Once you cross into Pennsylvania and approach York, there are large sections that are paved. The trail can be accessed from several locations with parking lots in Hunt Valley, Sparks, Monkton, Parkton, New Freedom and elsewhere. Foot traffic can be heavy on the weekends particularly between Hunt Valley and Sparks, and again North of Monkton for two miles.
There is a popular brewery not far from the trail in Parkton, MD.

The Baltimore and Annapolis Trail plus the BWI Trail are two distinct trails that connect at the northwestern trailhead of the Baltimore and Annapolis Trail via the John Overstreet Connector. So, back and forth to Annapolis is about 28 miles, then the loop around the Baltimore Washington International (BWI) Thurgood Marshal airport is another 10.5 miles.
We headed southeast on the Baltimore and Annapolis Trail, first alongside a runway (the parking lot is actually called the Thomas A. Dixon Observation Park) and then into the woods. For the next mile or so, we zigzagged through the forest until we came to a road sign that required us to stop and read it carefully. After crossing a highway bridge, we rode for the next 13 miles through a variety of settings.
There were many picturesque parts of the gently rolling trail: split-rail wooden fences along mowed grass aprons and large “mounds” of vine-covered trees. In many areas, the trail ran along the edges of well-kept neighborhoods where there were frequent, but not busy, intersections. Almost imperceptibly, the trail declined towards Annapolis – a fact we were only made aware of as we climbed back towards BWI. At about the 10-mile mark, we saw many bikers and runners stopped at a popular trailside coffee shop in Severna Park. This is the most convenient place to fill up on water or snacks. Next to it was an enormous pile of discarded bikes behind Pedal Pushers bike store.
After a few more miles of the quiet, mostly shaded trail, we reached the Annapolis trailhead then turned around. Thirteen or so miles later, we arrived back at the Observation Park and forced ourselves to do the BWI loop. Surprisingly, the BWI trail was NOT a tour of parking lots, airport hangars and shade-less runways. It was actually pretty in many spots and had an interesting array of vistas ranging from forests, to horse pastures, to overlooks of the airport, to neighborhoods, to highways. This is a very popular loop and one local biker told us that there were too many pedestrians to ride on the weekends.
Ireland’s most famous brewery has its only US brewery near BWI and it is both massive and a ton of fun.

Flat, easy for running walking or biking. Good connections to other trails

I bike this trail a few times a year. It is a well designed trail given the airport security constraints.